CURLALTSVC_H1 (int)
Available as of PHP 8.2.0 and cURL 7.64.1.

CURLALTSVC_H2 (int)
Available as of PHP 8.2.0 and cURL 7.64.1.

CURLALTSVC_H3 (int)
Available as of PHP 8.2.0 and cURL 7.64.1.

CURLALTSVC_READONLYFILE (int)
Available as of PHP 8.2.0 and cURL 7.64.1.

CURLAUTH_ANY (int)

CURLAUTH_ANYSAFE (int)

CURLAUTH_AWS_SIGV4 (int)
Available as of PHP 8.2.0 and cURL 7.75.0.

CURLAUTH_BASIC (int)

CURLAUTH_BEARER (int)
Available as of PHP 7.3.0 and cURL 7.61.0.

CURLAUTH_DIGEST (int)

CURLAUTH_DIGEST_IE (int)
Use HTTP Digest authentication with an IE flavor. Available as of cURL 7.19.3.

CURLAUTH_GSSAPI (int)
Available as of PHP 7.3.0 and cURL 7.54.1

CURLAUTH_GSSNEGOTIATE (int)

CURLAUTH_NEGOTIATE (int)
Available as of PHP 7.0.7 and cURL 7.38.0.

CURLAUTH_NONE (int)
Available as of cURL 7.10.6.

CURLAUTH_NTLM (int)

CURLAUTH_NTLM_WB (int)
Available as of PHP 7.0.7 and cURL 7.22.0

CURLAUTH_ONLY (int)
This is a meta symbol. OR this value together with a single specific auth value to force libcurl to probe for unrestricted auth and if not, only that single auth algorithm is acceptable. Available as of cURL 7.21.3.

CURLFOLLOW_ALL (int)
Value for CURLOPT_FOLLOWLOCATION that enables following redirects and keeps a custom request method set with CURLOPT_CUSTOMREQUEST in use for all requests, even after redirects. Available as of PHP 8.5.0 and cURL 8.13.0.

CURLFOLLOW_OBEYCODE (int)
Value for CURLOPT_FOLLOWLOCATION that enables following redirects while obeying the HTTP response code: a custom request method set with CURLOPT_CUSTOMREQUEST is kept, except that it is changed to GET on the redirect status codes that require it (such as 301, 302 and 303). Available as of PHP 8.5.0 and cURL 8.13.0.

CURLFOLLOW_FIRSTONLY (int)
Value for CURLOPT_FOLLOWLOCATION that enables following redirects but uses a custom request method set with CURLOPT_CUSTOMREQUEST for the first request only; subsequent requests follow the method dictated by the redirect response code. Available as of PHP 8.5.0 and cURL 8.13.0.

CURLFTPAUTH_DEFAULT (int)

CURLFTPAUTH_SSL (int)

CURLFTPAUTH_TLS (int)

CURLFTPMETHOD_DEFAULT (int)
Available as of PHP 8.2.0 and cURL 7.15.3.

CURLFTPMETHOD_MULTICWD (int)
Do a single CWD operation for each path part in the given URL. Available as of cURL 7.15.3.

CURLFTPMETHOD_NOCWD (int)
libcurl makes no CWD at all. libcurl does SIZE, RETR, STOR etc. and gives a full path to the server for all these commands. Available as of cURL 7.15.3.

CURLFTPMETHOD_SINGLECWD (int)
libcurl does one CWD with the full target directory and then operates on the file like in the multicwd case. Available as of cURL 7.15.3.

CURLFTPSSL_ALL (int)

CURLFTPSSL_CCC_ACTIVE (int)
Initiate the shutdown and wait for a reply. Available as of cURL 7.16.2.

CURLFTPSSL_CCC_NONE (int)
Do not attempt to use CCC (Clear Command Channel). Available as of cURL 7.16.2.

CURLFTPSSL_CCC_PASSIVE (int)
Do not initiate the shutdown, but wait for the server to do it. Do not send a reply. Available as of cURL 7.16.1.

CURLFTPSSL_CONTROL (int)

CURLFTPSSL_NONE (int)

CURLFTPSSL_TRY (int)

CURLFTP_CREATE_DIR (int)
Available as of PHP 7.0.7 and cURL 7.19.3

CURLFTP_CREATE_DIR_NONE (int)
Available as of PHP 7.0.7 and cURL 7.19.3

CURLFTP_CREATE_DIR_RETRY (int)
Available as of PHP 7.0.7 and cURL 7.19.3

CURLGSSAPI_DELEGATION_FLAG (int)
Allow unconditional GSSAPI credential delegation. Available as of cURL 7.22.0.

CURLGSSAPI_DELEGATION_POLICY_FLAG (int)
Delegate only if the OK-AS-DELEGATE flag is set in the service ticket if this feature is supported by the GSS-API implementation and the definition of GSS_C_DELEG_POLICY_FLAG was available at compile-time. Available as of cURL 7.22.0.

CURLHEADER_SEPARATE (int)
Available as of PHP 7.0.7 and cURL 7.37.0.

CURLHEADER_UNIFIED (int)
Available as of PHP 7.0.7 and cURL 7.37.0.

CURLHSTS_ENABLE (int)
Available as of PHP 8.2.0 and cURL 7.74.0

CURLHSTS_READONLYFILE (int)
Available as of PHP 8.2.0 and cURL 7.74.0

CURLKHMATCH_LAST (int)
Available as of PHP 8.3.0 and cURL 7.19.6

CURLKHMATCH_MISMATCH (int)
Available as of PHP 8.3.0 and cURL 7.19.6

CURLKHMATCH_MISSING (int)
Available as of PHP 8.3.0 and cURL 7.19.6

CURLKHMATCH_OK (int)
Available as of PHP 8.3.0 and cURL 7.19.6

CURLMIMEOPT_FORMESCAPE (int)
Available as of PHP 8.3.0 and cURL 7.81.0

CURLMSG_DONE (int)

CURLPIPE_HTTP1 (int)
Available as of cURL 7.43.0.

CURLPIPE_MULTIPLEX (int)
Available as of cURL 7.43.0.

CURLPIPE_NOTHING (int)
Available as of cURL 7.43.0.

CURLPROXY_HTTP (int)
Available as of cURL 7.10.

CURLPROXY_HTTPS (int)
Available as of PHP 7.3.0 and cURL 7.52.0

CURLPROXY_HTTP_1_0 (int)
Available as of PHP 7.0.7 and cURL 7.19.3

CURLPROXY_SOCKS4 (int)
Available as of cURL 7.10.

CURLPROXY_SOCKS4A (int)
Available as of cURL 7.18.0.

CURLPROXY_SOCKS5 (int)
Available as of cURL 7.10.

CURLPROXY_SOCKS5_HOSTNAME (int)
Available as of cURL 7.18.0.

CURLPX_BAD_ADDRESS_TYPE (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_BAD_VERSION (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_CLOSED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_GSSAPI (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_GSSAPI_PERMSG (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_GSSAPI_PROTECTION (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_IDENTD (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_IDENTD_DIFFER (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_LONG_HOSTNAME (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_LONG_PASSWD (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_LONG_USER (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_NO_AUTH (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_OK (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_RECV_ADDRESS (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_RECV_AUTH (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_RECV_CONNECT (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_RECV_REQACK (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_ADDRESS_TYPE_NOT_SUPPORTED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_COMMAND_NOT_SUPPORTED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_CONNECTION_REFUSED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_GENERAL_SERVER_FAILURE (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_HOST_UNREACHABLE (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_NETWORK_UNREACHABLE (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_NOT_ALLOWED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_TTL_EXPIRED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REPLY_UNASSIGNED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_REQUEST_FAILED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_RESOLVE_HOST (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_SEND_AUTH (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_SEND_CONNECT (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_SEND_REQUEST (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_UNKNOWN_FAIL (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_UNKNOWN_MODE (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLPX_USER_REJECTED (int)
Available as of PHP 8.2.0 and cURL 7.73.0

CURLSSH_AUTH_AGENT (int)
Available as of PHP 7.0.7 and cURL 7.28.0

CURLSSH_AUTH_ANY (int)

CURLSSH_AUTH_DEFAULT (int)

CURLSSH_AUTH_GSSAPI (int)
Available as of PHP 7.3.0 and cURL 7.58.0

CURLSSH_AUTH_HOST (int)

CURLSSH_AUTH_KEYBOARD (int)

CURLSSH_AUTH_NONE (int)

CURLSSH_AUTH_PASSWORD (int)

CURLSSH_AUTH_PUBLICKEY (int)

CURLSSLOPT_ALLOW_BEAST (int)
Available as of cURL 7.25.0

CURLSSLOPT_AUTO_CLIENT_CERT (int)
Available as of PHP 8.2.0 and cURL 7.77.0

CURLSSLOPT_NATIVE_CA (int)
Available as of PHP 8.2.0 and cURL 7.71.0

CURLSSLOPT_NO_PARTIALCHAIN (int)
Available as of PHP 8.2.0 and cURL 7.68.0

CURLSSLOPT_NO_REVOKE (int)
Available as of PHP 7.0.7 and cURL 7.44.0

CURLSSLOPT_REVOKE_BEST_EFFORT (int)
Available as of PHP 8.2.0 and cURL 7.70.0

CURLUSESSL_ALL (int)
Require SSL for all communication or fail with CURLE_USE_SSL_FAILED. Available as of cURL 7.17.0.

CURLUSESSL_CONTROL (int)
Require SSL for the control connection or fail with CURLE_USE_SSL_FAILED. Available as of cURL 7.17.0.

CURLUSESSL_NONE (int)
Do not attempt to use SSL. Available as of cURL 7.17.0.

CURLUSESSL_TRY (int)
Try using SSL, proceed as normal otherwise. Note that server may close the connection if the negotiation does not succeed. Available as of cURL 7.17.0.

CURLVERSION_NOW (int)

CURLWS_RAW_MODE (int)
Available as of PHP 8.3.0 and cURL 7.86.0

CURL_FNMATCHFUNC_FAIL (int)
Returned by the wildcard match callback function if an error occurred. Available as of cURL 7.21.0.

CURL_FNMATCHFUNC_MATCH (int)
Returned by the wildcard match callback function if pattern matches the string. Available as of cURL 7.21.0.

CURL_FNMATCHFUNC_NOMATCH (int)
Returned by the wildcard match callback function if pattern does not match the string. Available as of cURL 7.21.0.

CURL_HTTP_VERSION_1_0 (int)

CURL_HTTP_VERSION_1_1 (int)

CURL_HTTP_VERSION_2 (int)
Available as of PHP 7.0.7 and cURL 7.43.0

CURL_HTTP_VERSION_2TLS (int)
Available as of PHP 7.0.7 and cURL 7.47.0

CURL_HTTP_VERSION_2_0 (int)
Available as of cURL 7.33.0

CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE (int)
Available as of PHP 7.0.7 and cURL 7.49.0

CURL_HTTP_VERSION_3 (int)
Available as of PHP 8.4.0 and cURL 7.66.0.

CURL_HTTP_VERSION_3ONLY (int)
Available as of PHP 8.4.0 and cURL 7.88.0.

CURL_HTTP_VERSION_NONE (int)

CURL_IPRESOLVE_V4 (int)
Use only IPv4 addresses when establishing a connection or choosing one from the connection pool. Available as of cURL 7.10.8.

CURL_IPRESOLVE_V6 (int)
Use only IPv6 addresses when establishing a connection or choosing one from the connection pool. Available as of cURL 7.10.8.

CURL_IPRESOLVE_WHATEVER (int)
Use addresses of all IP versions allowed by the system. Available as of cURL 7.10.8.

CURL_MAX_READ_SIZE (int)
Available as of PHP 7.3.0 and cURL 7.53.0

CURL_NETRC_IGNORED (int)

CURL_NETRC_OPTIONAL (int)

CURL_NETRC_REQUIRED (int)

CURL_PUSH_DENY (int)
Available as of PHP 7.1.0 and cURL 7.44.0

CURL_PUSH_OK (int)
Available as of PHP 7.1.0 and cURL 7.44.0

CURL_READFUNC_PAUSE (int)
Available as of cURL 7.18.0.

CURL_REDIR_POST_301 (int)
Available as of PHP 7.0.7 and cURL 7.18.2

CURL_REDIR_POST_302 (int)
Available as of PHP 7.0.7 and cURL 7.18.2

CURL_REDIR_POST_303 (int)
Available as of PHP 7.0.7 and cURL 7.25.1

CURL_REDIR_POST_ALL (int)
Available as of PHP 7.0.7 and cURL 7.18.2

CURL_RTSPREQ_ANNOUNCE (int)
When sent by a client, this method changes the description of the session. ANNOUNCE acts like an HTTP PUT or POST just like CURL_RTSPREQ_SET_PARAMETER. Available as of cURL 7.20.0.

CURL_RTSPREQ_DESCRIBE (int)
Used to get the low level description of a stream. The application should note what formats it understands in the Accept: header. Unless set manually, libcurl automatically adds in Accept: application/sdp. Time-condition headers are added to DESCRIBE requests if the CURLOPT_TIMECONDITION option is used. Available as of cURL 7.20.0.

CURL_RTSPREQ_GET_PARAMETER (int)
Retrieve a parameter from the server. By default, libcurl adds a Content-Type: text/parameters header on all non-empty requests unless a custom one is set. GET_PARAMETER acts just like an HTTP PUT or POST. Applications wishing to send a heartbeat message should use an empty GET_PARAMETER request. Available as of cURL 7.20.0.

CURL_RTSPREQ_OPTIONS (int)
Used to retrieve the available methods of the server. Available as of cURL 7.20.0.

CURL_RTSPREQ_PAUSE (int)
Send a PAUSE command to the server. Use the CURLOPT_RANGE option with a single value to indicate when the stream should be halted (e.g. npt=25). Available as of cURL 7.20.0.

CURL_RTSPREQ_PLAY (int)
Send a PLAY command to the server. Use the CURLOPT_RANGE option to modify the playback time (e.g. npt=10-15). Available as of cURL 7.20.0.

CURL_RTSPREQ_RECEIVE (int)
Set the RTSP request type to this value to receive interleaved RTP data. Available as of cURL 7.20.0.

CURL_RTSPREQ_RECORD (int)
Used to tell the server to record a session. Use the CURLOPT_RANGE option to modify the record time. Available as of cURL 7.20.0.

CURL_RTSPREQ_SETUP (int)
Used to initialize the transport layer for the session. Available as of cURL 7.20.0.

CURL_RTSPREQ_SET_PARAMETER (int)
Set a parameter on the server. Available as of cURL 7.20.0.

CURL_RTSPREQ_TEARDOWN (int)
Terminates an RTSP session. Simply closing a connection does not terminate the RTSP session since it is valid to control an RTSP session over different connections. Available as of cURL 7.20.0.

CURL_SSLVERSION_DEFAULT (int)

CURL_SSLVERSION_MAX_DEFAULT (int)
Available as of PHP 7.3.0 and cURL 7.54.0

CURL_SSLVERSION_MAX_NONE (int)
Available as of PHP 7.3.0 and cURL 7.54.0

CURL_SSLVERSION_MAX_TLSv1_0 (int)
Available as of PHP 7.3.0 and cURL 7.54.0

CURL_SSLVERSION_MAX_TLSv1_1 (int)
Available as of PHP 7.3.0 and cURL 7.54.0

CURL_SSLVERSION_MAX_TLSv1_2 (int)
Available as of PHP 7.3.0 and cURL 7.54.0

CURL_SSLVERSION_MAX_TLSv1_3 (int)
Available as of PHP 7.3.0 and cURL 7.54.0

CURL_SSLVERSION_SSLv2 (int)

CURL_SSLVERSION_SSLv3 (int)

CURL_SSLVERSION_TLSv1 (int)

CURL_SSLVERSION_TLSv1_0 (int)

CURL_SSLVERSION_TLSv1_1 (int)

CURL_SSLVERSION_TLSv1_2 (int)

CURL_SSLVERSION_TLSv1_3 (int)
Available as of PHP 7.3.0 and cURL 7.52.0

CURL_TIMECOND_IFMODSINCE (int)

CURL_TIMECOND_IFUNMODSINCE (int)

CURL_TIMECOND_LASTMOD (int)

CURL_TIMECOND_NONE (int)

CURL_TLSAUTH_SRP (int)
Available as of cURL 7.21.4.

CURL_VERSION_ALTSVC (int)
Available as of PHP 7.3.6 and cURL 7.64.1

CURL_VERSION_ASYNCHDNS (int)
Asynchronous DNS resolves. Available as of PHP 7.3.0 and cURL 7.10.7

CURL_VERSION_BROTLI (int)
Available as of PHP 7.3.0 and cURL 7.57.0

CURL_VERSION_CONV (int)
Character conversions supported. Available as of PHP 7.3.0 and cURL 7.15.4

CURL_VERSION_CURLDEBUG (int)
Debug memory tracking supported. Available as of PHP 7.3.6 and cURL 7.19.6

CURL_VERSION_DEBUG (int)
Built with debug capabilities. Available as of PHP 7.3.0 and cURL 7.10.6

CURL_VERSION_GSASL (int)
Available as of PHP 8.2.0 and cURL 7.76.0

CURL_VERSION_GSSAPI (int)
Built against a GSS-API library. Available as of PHP 7.3.0 and cURL 7.38.0

CURL_VERSION_GSSNEGOTIATE (int)
Negotiate auth is supported. Available as of PHP 7.3.0 and cURL 7.10.6 (deprecated as of cURL 7.38.0)

CURL_VERSION_HSTS (int)
Available as of PHP 8.2.0 and cURL 7.74.0

CURL_VERSION_HTTP2 (int)
HTTP2 support built-in. Available as of cURL 7.33.0

CURL_VERSION_HTTP3 (int)
Available as of PHP 8.2.0 and cURL 7.66.0

CURL_VERSION_HTTPS_PROXY (int)
Available as of PHP 7.3.0 and cURL 7.52.0

CURL_VERSION_IDN (int)
Internationalized Domain Names are supported. Available as of PHP 7.3.0 and cURL 7.12.0

CURL_VERSION_IPV6 (int)
IPv6-enabled.

CURL_VERSION_KERBEROS4 (int)
Kerberos V4 auth is supported.

CURL_VERSION_KERBEROS5 (int)
Kerberos V5 auth is supported. Available as of PHP 7.0.7 and cURL 7.40.0

CURL_VERSION_LARGEFILE (int)
Supports files larger than 2GB. Available as of cURL 7.33.0

CURL_VERSION_LIBZ (int)
libz features are present.

CURL_VERSION_MULTI_SSL (int)
Available as of PHP 7.3.0 and cURL 7.56.0

CURL_VERSION_NTLM (int)
NTLM auth is supported. Available as of PHP 7.3.0 and cURL 7.10.6

CURL_VERSION_NTLM_WB (int)
NTLM delegation to winbind helper is supported. Available as of PHP 7.3.0 and cURL 7.22.0

CURL_VERSION_PSL (int)
Mozilla's Public Suffix List, used for cookie domain verification. Available as of PHP 7.3.6 and cURL 7.47.0

CURL_VERSION_SPNEGO (int)
SPNEGO auth is supported. Available as of PHP 7.3.0 and cURL 7.10.8

CURL_VERSION_SSL (int)
SSL options are present.

CURL_VERSION_SSPI (int)
Built against Windows SSPI. Available as of PHP 7.3.0 and cURL 7.13.2

CURL_VERSION_TLSAUTH_SRP (int)
TLS-SRP auth is supported. Available as of PHP 7.3.0 and cURL 7.21.4

CURL_VERSION_UNICODE (int)
Available as of PHP 8.2.0 and cURL 7.72.0

CURL_VERSION_UNIX_SOCKETS (int)
Unix domain sockets support. Available as of PHP 7.0.7 and cURL 7.40.0

CURL_VERSION_ZSTD (int)
Available as of PHP 8.2.0 and cURL 7.72.0

CURL_WRITEFUNC_PAUSE (int)
Available as of cURL 7.18.0.

CURL_PREREQFUNC_OK (int)
Available as of PHP 8.4.0 and cURL 7.80.0.

CURL_PREREQFUNC_ABORT (int)
Available as of PHP 8.4.0 and cURL 7.80.0.

CURLE_ABORTED_BY_CALLBACK (int)
Aborted by callback. A callback returned "abort" to libcurl.

CURLE_BAD_CALLING_ORDER (int)

CURLE_BAD_CONTENT_ENCODING (int)
Unrecognized transfer encoding.

CURLE_BAD_DOWNLOAD_RESUME (int)
The download could not be resumed because the specified offset was out of the file boundary.

CURLE_BAD_FUNCTION_ARGUMENT (int)
A function was called with a bad parameter.

CURLE_BAD_PASSWORD_ENTERED (int)

CURLE_COULDNT_CONNECT (int)
Failed to connect to host or proxy.

CURLE_COULDNT_RESOLVE_HOST (int)
Could not resolve host. The given remote host was not resolved.

CURLE_COULDNT_RESOLVE_PROXY (int)
Could not resolve proxy. The given proxy host could not be resolved.

CURLE_FAILED_INIT (int)
Early initialization code failed. This is likely to be an internal error or problem, or a resource problem where something fundamental could not get done at init time.

CURLE_FILESIZE_EXCEEDED (int)
Maximum file size exceeded.

CURLE_FILE_COULDNT_READ_FILE (int)
A file given with FILE:// could not be opened. Most likely because the file path does not identify an existing file or due to the lack of appropriate file permissions.

CURLE_FTP_ACCESS_DENIED (int)

CURLE_FTP_BAD_DOWNLOAD_RESUME (int)

CURLE_FTP_CANT_GET_HOST (int)
An internal failure to lookup the host used for the new connection.

CURLE_FTP_CANT_RECONNECT (int)

CURLE_FTP_COULDNT_GET_SIZE (int)

CURLE_FTP_COULDNT_RETR_FILE (int)
This was either a unexpected reply to a 'RETR' command or a zero byte transfer complete.

CURLE_FTP_COULDNT_SET_ASCII (int)

CURLE_FTP_COULDNT_SET_BINARY (int)

CURLE_FTP_COULDNT_STOR_FILE (int)

CURLE_FTP_COULDNT_USE_REST (int)
The FTP REST command returned error. This should never happen if the server is sane.

CURLE_FTP_PARTIAL_FILE (int)

CURLE_FTP_PORT_FAILED (int)
The FTP PORT command returned error. This mostly happens when a good enough address has not been specified for libcurl to use. See CURLOPT_FTPPORT.

CURLE_FTP_QUOTE_ERROR (int)

CURLE_FTP_SSL_FAILED (int)

CURLE_FTP_USER_PASSWORD_INCORRECT (int)

CURLE_FTP_WEIRD_227_FORMAT (int)
FTP servers return a 227-line as a response to a PASV command. If libcurl fails to parse that line, this return code is passed back.

CURLE_FTP_WEIRD_PASS_REPLY (int)
After having sent the FTP password to the server, libcurl expects a proper reply. This error code indicates that an unexpected code was returned.

CURLE_FTP_WEIRD_PASV_REPLY (int)
libcurl failed to get a sensible result back from the server as a response to either a PASV or a EPSV command. The server is flawed.

CURLE_FTP_WEIRD_SERVER_REPLY (int)
The server sent data libcurl could not parse. This error code is known as CURLE_WEIRD_SERVER_REPLY as of cURL 7.51.0.

CURLE_FTP_WEIRD_USER_REPLY (int)

CURLE_FTP_WRITE_ERROR (int)

CURLE_FUNCTION_NOT_FOUND (int)
Function not found. A required zlib function was not found.

CURLE_GOT_NOTHING (int)
Nothing was returned from the server, and under the circumstances, getting nothing is considered an error.

CURLE_HTTP_NOT_FOUND (int)

CURLE_HTTP_PORT_FAILED (int)

CURLE_HTTP_POST_ERROR (int)
This is an odd error that mainly occurs due to internal confusion.

CURLE_HTTP_RANGE_ERROR (int)

CURLE_HTTP_RETURNED_ERROR (int)
This is returned if CURLOPT_FAILONERROR is set ENTITY and the HTTP server returns an error code that is greater than or equal to 400.

CURLE_LDAP_CANNOT_BIND (int)
LDAP cannot bind. LDAP bind operation failed.

CURLE_LDAP_INVALID_URL (int)

CURLE_LDAP_SEARCH_FAILED (int)
LDAP search failed.

CURLE_LIBRARY_NOT_FOUND (int)

CURLE_MALFORMAT_USER (int)

CURLE_OBSOLETE (int)

CURLE_OK (int)
All fine. Proceed as usual.

CURLE_OPERATION_TIMEDOUT (int)
Operation timeout. The specified time-out period was reached according to the conditions.

CURLE_OPERATION_TIMEOUTED (int)

CURLE_OUT_OF_MEMORY (int)
A memory allocation request failed.

CURLE_PARTIAL_FILE (int)
A file transfer was shorter or larger than expected. This happens when the server first reports an expected transfer size, and then delivers data that does not match the previously given size.

CURLE_PROXY (int)
Proxy handshake error. CURLINFO_PROXY_ERROR provides extra details on the specific problem. Available as of PHP 8.2.0 and cURL 7.73.0

CURLE_READ_ERROR (int)
There was a problem reading a local file or an error returned by the read callback.

CURLE_RECV_ERROR (int)
Failure with receiving network data.

CURLE_SEND_ERROR (int)
Failed sending network data.

CURLE_SHARE_IN_USE (int)

CURLE_SSH (int)
An unspecified error occurred during the SSH session. Available as of cURL 7.16.1.

CURLE_SSL_CACERT (int)

CURLE_SSL_CACERT_BADFILE (int)
Problem with reading the SSL CA cert.

CURLE_SSL_CERTPROBLEM (int)
Problem with the local client certificate.

CURLE_SSL_CIPHER (int)
Could not use specified cipher.

CURLE_SSL_CONNECT_ERROR (int)
A problem occurred somewhere in the SSL/TLS handshake. Reading the message in the error buffer provides more details on the problem. Could be certificates (file formats, paths, permissions), passwords, and others.

CURLE_SSL_ENGINE_NOTFOUND (int)
The specified crypto engine was not found.

CURLE_SSL_ENGINE_SETFAILED (int)
Failed setting the selected SSL crypto engine as default.

CURLE_SSL_PEER_CERTIFICATE (int)

CURLE_SSL_PINNEDPUBKEYNOTMATCH (int)
Failed to match the pinned key specified with CURLOPT_PINNEDPUBLICKEY.

CURLE_TELNET_OPTION_SYNTAX (int)

CURLE_TOO_MANY_REDIRECTS (int)
Too many redirects. When following redirects, libcurl hit the maximum amount. The limit can be set with CURLOPT_MAXREDIRS.

CURLE_UNKNOWN_TELNET_OPTION (int)

CURLE_UNSUPPORTED_PROTOCOL (int)
The URL passed to libcurl used a protocol that libcurl does not support. The issue might be a compile-time option that was not used, a misspelled protocol string or just a protocol libcurl has no code for.

CURLE_URL_MALFORMAT (int)
The URL was not properly formatted.

CURLE_URL_MALFORMAT_USER (int)

CURLE_WEIRD_SERVER_REPLY (int)
The server sent data libcurl could not parse. This error code was known as CURLE_FTP_WEIRD_SERVER_REPLY before cURL 7.51.0. Available as of PHP 7.3.0 and cURL 7.51.0

CURLE_WRITE_ERROR (int)
An error occurred when writing received data to a local file, or an error was returned to libcurl from a write callback.

CURLINFO_APPCONNECT_TIME (int)
Time in seconds it took from the start until the SSL/SSH connect/handshake to the remote host was completed

CURLINFO_APPCONNECT_TIME_T (int)
Time, in microseconds, it took from the start until the SSL/SSH connect/handshake to the remote host was completed. Available as of PHP 7.3.0 and cURL 7.61.0

CURLINFO_CAINFO (int)
Default built-in CA certificate path. Available as of PHP 8.3.0 and cURL 7.84.0

CURLINFO_CAPATH (int)
Default built-in CA path string. Available as of PHP 8.3.0 and cURL 7.84.0

CURLINFO_CERTINFO (int)
TLS certificate chain

CURLINFO_CONDITION_UNMET (int)
Info on unmet time conditional

CURLINFO_CONN_ID (int)
The ID of the last connection used by the transfer. The connection ID is unique among all connections using the same connection cache and is useful to tell connection reuse apart. Available as of PHP 8.5.0 and cURL 8.2.0.

CURLINFO_CONNECT_TIME (int)
Time in seconds it took to establish the connection

CURLINFO_CONNECT_TIME_T (int)
Total time taken, in microseconds, from the start until the connection to the remote host (or proxy) was completed. Available as of PHP 7.3.0 and cURL 7.61.0

CURLINFO_CONTENT_LENGTH_DOWNLOAD (int)
Content length of download, read from Content-Length: field. Deprecated since cURL 7.55.0. Use CURLINFO_CONTENT_LENGTH_DOWNLOAD_T instead.

CURLINFO_CONTENT_LENGTH_DOWNLOAD_T (int)
The content-length of the download. This is the value read from the Content-Length: field. -1 if the size isn't known. Available as of PHP 7.3.0 and cURL 7.55.0

CURLINFO_CONTENT_LENGTH_UPLOAD (int)
Specified size of upload. Deprecated since cURL 7.55.0. Use CURLINFO_CONTENT_LENGTH_UPLOAD_T instead.

CURLINFO_CONTENT_LENGTH_UPLOAD_T (int)
The specified size of the upload. -1 if the size isn't known. Available as of PHP 7.3.0 and cURL 7.55.0

CURLINFO_CONTENT_TYPE (int)
Content-Type of the requested document. NULL indicates server did not send valid Content-Type header

CURLINFO_COOKIELIST (int)
All known cookies

CURLINFO_EFFECTIVE_METHOD (int)
Get the last used HTTP method.

CURLINFO_EFFECTIVE_URL (int)
Last effective URL

CURLINFO_FILETIME (int)
Remote time of the retrieved document, with the CURLOPT_FILETIME enabled; if -1 is returned the time of the document is unknown

CURLINFO_FILETIME_T (int)
Remote time of the retrieved document (as Unix timestamp), an alternative to CURLINFO_FILETIME to allow systems with 32 bit long variables to extract dates outside of the 32bit timestamp range. Available as of PHP 7.3.0 and cURL 7.59.0

CURLINFO_FTP_ENTRY_PATH (int)
Entry path in FTP server

CURLINFO_HEADER_OUT (int)
The request string sent. For this to work, add the CURLINFO_HEADER_OUT option to the handle by calling curl_setopt

CURLINFO_HEADER_SIZE (int)
Total size of all headers received

CURLINFO_HTTPAUTH_AVAIL (int)
Bitmask indicating the authentication method(s) available according to the previous response

CURLINFO_HTTPAUTH_USED (int)
Bitmask indicating the HTTP authentication method(s) actually used in the previous request. Available as of PHP 8.5.0 and cURL 8.12.0.

CURLINFO_HTTP_CODE (int)
The last response code. As of cURL 7.10.8, this is a legacy alias of CURLINFO_RESPONSE_CODE.

CURLINFO_HTTP_CONNECTCODE (int)
The CONNECT response code

CURLINFO_HTTP_VERSION (int)
The version used in the last HTTP connection. The return value will be one of the defined CURL_HTTP_VERSION_* constants or 0 if the version can't be determined. Available as of PHP 7.3.0 and cURL 7.50.0

CURLINFO_LASTONE (int)
The last enum value in the underlying CURLINFO enum in libcurl.

CURLINFO_LOCAL_IP (int)
Local (source) IP address of the most recent connection

CURLINFO_LOCAL_PORT (int)
Local (source) port of the most recent connection

CURLINFO_NAMELOOKUP_TIME (int)
Time in seconds until name resolving was complete

CURLINFO_NAMELOOKUP_TIME_T (int)
Time in microseconds from the start until the name resolving was completed. Available as of PHP 7.3.0 and cURL 7.61.0

CURLINFO_NUM_CONNECTS (int)
Number of connections curl had to create to achieve the previous transfer

CURLINFO_OS_ERRNO (int)
Errno from a connect failure. The number is OS and system specific.

CURLINFO_PRETRANSFER_TIME (int)
Time in seconds from start until just before file transfer begins

CURLINFO_PRETRANSFER_TIME_T (int)
Time taken from the start until the file transfer is just about to begin, in microseconds. Available as of PHP 7.3.0 and cURL 7.61.0

CURLINFO_PRIMARY_IP (int)
IP address of the most recent connection

CURLINFO_PRIMARY_PORT (int)
Destination port of the most recent connection

CURLINFO_PRIVATE (int)
Private data associated with this cURL handle, previously set with the CURLOPT_PRIVATE option of curl_setopt

CURLINFO_PROTOCOL (int)
The protocol used in the last HTTP connection. The returned value will be exactly one of the CURLPROTO_* values. Available as of PHP 7.3.0 and cURL 7.52.0. Deprecated since cURL 7.85.0. Use CURLINFO_SCHEME instead.

CURLINFO_PROXYAUTH_AVAIL (int)
Bitmask indicating the proxy authentication method(s) available according to the previous response

CURLINFO_PROXYAUTH_USED (int)
Bitmask indicating the proxy authentication method(s) actually used in the previous request. Available as of PHP 8.5.0 and cURL 8.12.0.

CURLINFO_PROXY_ERROR (int)
The detailed (SOCKS) proxy error code when the most recent transfer returned a CURLE_PROXY error. The returned value will be exactly one of the CURLPX_* values. The error code will be CURLPX_OK if no response code was available. Available as of PHP 8.2.0 and cURL 7.73.0

CURLINFO_PROXY_SSL_VERIFYRESULT (int)
The result of the certificate verification that was requested (using the CURLOPT_PROXY_SSL_VERIFYPEER option). Only used for HTTPS proxies. Available as of PHP 7.3.0 and cURL 7.52.0

CURLINFO_QUEUE_TIME_T (int)
The time, in microseconds, that the transfer was held in a waiting queue before it started, due to limits set with CURLMOPT_MAX_TOTAL_CONNECTIONS or similar options. Available as of PHP 8.5.0 and cURL 8.6.0.

CURLINFO_REDIRECT_COUNT (int)
Number of redirects, with the CURLOPT_FOLLOWLOCATION option enabled

CURLINFO_REDIRECT_TIME (int)
Time in seconds of all redirection steps before final transaction was started, with the CURLOPT_FOLLOWLOCATION option enabled

CURLINFO_REDIRECT_TIME_T (int)
Total time, in microseconds, it took for all redirection steps include name lookup, connect, pretransfer and transfer before final transaction was started. Available as of PHP 7.3.0 and cURL 7.61.0

CURLINFO_REDIRECT_URL (int)
With the CURLOPT_FOLLOWLOCATION option disabled: redirect URL found in the last transaction, that should be requested manually next. With the CURLOPT_FOLLOWLOCATION option enabled: this is empty. The redirect URL in this case is available in CURLINFO_EFFECTIVE_URL

CURLINFO_REFERER (int)
The Referer header. Available as of PHP 8.2.0 and cURL 7.76.0

CURLINFO_REQUEST_SIZE (int)
Total size of issued requests, currently only for HTTP requests

CURLINFO_RESPONSE_CODE (int)
The last response code. Available as of cURL 7.10.8

CURLINFO_RETRY_AFTER (int)
The information from the Retry-After header, or zero if there was no valid header. Available as of PHP 8.2.0 and cURL 7.66.0

CURLINFO_RTSP_CLIENT_CSEQ (int)
Next RTSP client CSeq

CURLINFO_RTSP_CSEQ_RECV (int)
Recently received CSeq

CURLINFO_RTSP_SERVER_CSEQ (int)
Next RTSP server CSeq

CURLINFO_RTSP_SESSION_ID (int)
RTSP session ID

CURLINFO_SCHEME (int)
The URL scheme used for the most recent connection. Available as of PHP 7.3.0 and cURL 7.52.0

CURLINFO_SIZE_DOWNLOAD (int)
Total number of bytes downloaded. Deprecated since cURL 7.55.0. Use CURLINFO_SIZE_DOWNLOAD_T instead.

CURLINFO_SIZE_DOWNLOAD_T (int)
Total number of bytes that were downloaded. The number is only for the latest transfer and will be reset again for each new transfer. Available as of PHP 7.3.0 and cURL 7.50.0

CURLINFO_SIZE_UPLOAD (int)
Total number of bytes uploaded. Deprecated since cURL 7.55.0. Use CURLINFO_SIZE_UPLOAD_T instead.

CURLINFO_SIZE_UPLOAD_T (int)
Total number of bytes that were uploaded. Available as of PHP 7.3.0 and cURL 7.50.0

CURLINFO_SPEED_DOWNLOAD (int)
Average download speed. Deprecated since cURL 7.55.0. Use CURLINFO_SPEED_DOWNLOAD_T instead.

CURLINFO_SPEED_DOWNLOAD_T (int)
The average download speed in bytes/second that curl measured for the complete download. Available as of PHP 7.3.0 and cURL 7.50.0

CURLINFO_SPEED_UPLOAD (int)
Average upload speed. Deprecated since cURL 7.55.0. Use CURLINFO_SPEED_UPLOAD_T instead.

CURLINFO_SPEED_UPLOAD_T (int)
The average upload speed in bytes/second that curl measured for the complete upload. Available as of PHP 7.3.0 and cURL 7.50.0

CURLINFO_SSL_ENGINES (int)
OpenSSL crypto-engines supported

CURLINFO_SSL_VERIFYRESULT (int)
Result of SSL certification verification requested by setting CURLOPT_SSL_VERIFYPEER

CURLINFO_STARTTRANSFER_TIME (int)
Time in seconds until the first byte is about to be transferred

CURLINFO_STARTTRANSFER_TIME_T (int)
Time, in microseconds, it took from the start until the first byte is received. Available as of PHP 7.3.0 and cURL 7.61.0

CURLINFO_TOTAL_TIME (int)
Total transaction time in seconds for last transfer

CURLINFO_TOTAL_TIME_T (int)
Total time in microseconds for the previous transfer, including name resolving, TCP connect etc. Available as of PHP 7.3.0 and cURL 7.61.0

CURLINFO_USED_PROXY (int)
Whether the previous transfer used a proxy; returns 1 if a proxy was used and 0 otherwise. Available as of PHP 8.5.0 and cURL 8.7.0.

CURLINFO_POSTTRANSFER_TIME_T (int)
Time it took from the start until the last byte is sent, in microseconds. Available as of PHP 8.4.0 and cURL 8.10.0

CURLM_ADDED_ALREADY (int)
An easy handle already added to a multi handle was attempted to get added a second time. Available as of cURL 7.32.1.

CURLM_BAD_EASY_HANDLE (int)
An easy handle was not good/valid. It could mean that it is not an easy handle at all, or possibly that the handle already is in use by this or another multi handle. Available as of cURL 7.9.6.

CURLM_BAD_HANDLE (int)
The passed-in handle is not a valid multi handle. Available as of cURL 7.9.6.

CURLM_CALL_MULTI_PERFORM (int)
As of cURL 7.20.0, this constant is not used. Before cURL 7.20.0, this status could be returned by curl_multi_exec when curl_multi_select or a similar function was called before it returned any other constant. Available as of cURL 7.9.6.

CURLM_INTERNAL_ERROR (int)
Internal libcurl error. Available as of cURL 7.9.6.

CURLM_OK (int)
No errors. Available as of cURL 7.9.6.

CURLM_OUT_OF_MEMORY (int)
Ran out of memory while processing multi handles. Available as of cURL 7.9.6.

CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE (int)
Specifies the chunk length threshold for pipelining in bytes. Available as of PHP 7.0.7 and cURL 7.30.0

CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE (int)
Specifies the size threshold for pipelining penalty in bytes. Available as of PHP 7.0.7 and cURL 7.30.0

CURLMOPT_MAXCONNECTS (int)
Specifies the maximum amount of simultaneously open connections that libcurl may cache. By default the size will be enlarged to fit four times the number of handles added via curl_multi_add_handle. When the cache is full, curl closes the oldest one in the cache to prevent the number of open connections from increasing. Available as of cURL 7.16.3.

CURLMOPT_MAX_CONCURRENT_STREAMS (int)
Specifies the maximum number of concurrent streams for connections that cURL should support on connections using HTTP/2. Valid values range from 1 to 2147483647 (2^31 - 1). The value passed here would be honored based on other system resources properties. Default is 100. Available as of PHP 8.2.0 and cURL 7.67.0.

CURLMOPT_MAX_HOST_CONNECTIONS (int)
Specifies the maximum number of connections to a single host. Available as of PHP 7.0.7 and cURL 7.30.0

CURLMOPT_MAX_PIPELINE_LENGTH (int)
Specifies the maximum number of requests in a pipeline. Available as of PHP 7.0.7 and cURL 7.30.0

CURLMOPT_MAX_TOTAL_CONNECTIONS (int)
Specifies the maximum number of simultaneously open connections. Available as of PHP 7.0.7 and cURL 7.30.0

CURLMOPT_PIPELINING (int)
Pass 1 to enable or 0 to disable. Enabling pipelining on a multi handle will make it attempt to perform HTTP Pipelining as far as possible for transfers using this handle. This means that adding a second request that can use an already existing connection will "pipe" the second request on the same connection. As of cURL 7.43.0, the value is a bitmask, and passing 2 will try to multiplex the new transfer over an existing HTTP/2 connection. Passing 3 instructs cURL to ask for pipelining and multiplexing independently of each other. As of cURL 7.62.0, setting the pipelining bit has no effect. Instead of integer literals, the CURLPIPE_* constants can also be used. Available as of cURL 7.16.0.

CURLMOPT_PUSHFUNCTION (int)
Pass a callable that will be registered to handle server pushes and should have the following signature: int<pushfunction> resource``parent_ch resource``pushed_ch array``headers

The push function is supposed to return either CURL_PUSH_OK if it can handle the push, or CURL_PUSH_DENY to reject it. Available as of PHP 7.1.0 and cURL 7.44.0

CURLPAUSE_ALL (int)
Pause sending and receiving data. Available as of cURL 7.18.0.

CURLPAUSE_CONT (int)
Unpause sending and receiving data. Available as of cURL 7.18.0.

CURLPAUSE_RECV (int)
Pause receiving data. Available as of cURL 7.18.0.

CURLPAUSE_RECV_CONT (int)
Unpause receiving data. Available as of cURL 7.18.0.

CURLPAUSE_SEND (int)
Pause sending data. Available as of cURL 7.18.0.

CURLPAUSE_SEND_CONT (int)
Unpause sending data. Available as of cURL 7.18.0.

CURLOPT_ABSTRACT_UNIX_SOCKET (int)
Enables the use of an abstract Unix domain socket instead of establishing a TCP connection to a host and sets the path to the given string. This option shares the same semantics as CURLOPT_UNIX_SOCKET_PATH. These two options share the same storage and therefore only one of them can be set per handle. Available as of PHP 7.3.0 and cURL 7.53.0.

CURLOPT_ACCEPT_ENCODING (int)
Sets a string with the contents of the Accept-Encoding: header sent in an HTTP request. Set to ENTITY to disable sending the Accept-Encoding: header. Defaults to ENTITY. Available as of cURL 7.21.6.

CURLOPT_ACCEPTTIMEOUT_MS (int)
The maximum number of milliseconds to wait for a server to connect back to cURL when an active FTP connection is used. This option accepts any value that can be cast to a valid int. Defaults to 60000 milliseconds. Available as of cURL 7.24.0.

CURLOPT_ADDRESS_SCOPE (int)
The scope id value to use when connecting to IPv6 addresses. This option accepts any value that can be cast to a valid int. Defaults to 0. Available as of cURL 7.19.0.

CURLOPT_ALTSVC (int)
Pass a string with the filename for cURL to use as the Alt-Svc cache file to read existing cache contents from and possibly also write it back to a after a transfer, unless CURLALTSVC_READONLYFILE is set via CURLOPT_ALTSVC_CTRL. Available as of PHP 8.2.0 and cURL 7.64.1.

CURLOPT_ALTSVC_CTRL (int)
Populate the bitmask with the correct set of features to instruct cURL how to handle Alt-Svc for the transfers using this handle. cURL only accepts Alt-Svc headers over HTTPS. It will also only complete a request to an alternative origin if that origin is properly hosted over HTTPS. Setting any bit will enable the alt-svc engine. Set to any of the CURLALTSVC_* constants. Defaults to Alt-Svc handling being disabled. Available as of PHP 8.2.0 and cURL 7.64.1.

CURLOPT_APPEND (int)
Setting this option to 1 will cause FTP uploads to append to the remote file instead of overwriting it. Defaults to 0. Available as of cURL 7.17.0.

CURLOPT_AUTOREFERER (int)
ENTITY to automatically set the Referer: field in requests where it follows a Location: redirect. Defaults to 0. Available as of cURL 7.1.0.

CURLOPT_AWS_SIGV4 (int)
Provides AWS V4 signature authentication on HTTP(S) header as a string. This option overrides any other authentication types that have been set in CURLOPT_HTTPAUTH. This method cannot be combined with other authentication types. Available as of PHP 8.2.0 and cURL 7.75.0.

CURLOPT_BINARYTRANSFER (int)
This constant is no longer used as of PHP 5.5.0. Deprecated as of PHP 8.4.0.

CURLOPT_BUFFERSIZE (int)
The size of the buffer to use for each read. There is no guarantee this request will be fulfilled, however. This option accepts any value that can be cast to a valid int. Defaults to CURL_MAX_WRITE_SIZE (currently, 16kB). Available as of cURL 7.10.

CURLOPT_CAINFO (int)
A string with the name of a file holding one or more certificates to verify the peer with. This only makes sense when used in combination with CURLOPT_SSL_VERIFYPEER. Might require an absolute path. Available as of cURL 7.4.2.

CURLOPT_CAINFO_BLOB (int)
A binary string of PEM encoded content holding one or more certificates to verify the peer with. This option overrides CURLOPT_CAINFO. Available as of PHP 8.2.0 and cURL 7.77.0.

CURLOPT_CAPATH (int)
A string with a directory that holds multiple CA certificates. Use this option alongside CURLOPT_SSL_VERIFYPEER. Available as of cURL 7.9.8.

CURLOPT_CA_CACHE_TIMEOUT (int)
Sets the maximum time in seconds any in memory cached CA certificate store may be kept and reused for new connections. This option accepts any value that can be cast to a valid int. Defaults to 86400 (24 hours). Available as of PHP 8.3.0 and cURL 7.87.0

CURLOPT_CERTINFO (int)
ENTITY to output SSL certification information to STDERR on secure transfers. Requires CURLOPT_VERBOSE to be on to have an effect. Defaults to ENTITY. Available as of cURL 7.19.1.

CURLOPT_CONNECTTIMEOUT (int)
The number of seconds to wait while trying to connect. Use 0 to wait indefinitely. This option accepts any value that can be cast to a valid int. Defaults to 300. Available as of cURL 7.7.0.

CURLOPT_CONNECTTIMEOUT_MS (int)
The number of milliseconds to wait while trying to connect. Use 0 to wait indefinitely. If cURL is built to use the standard system name resolver, that portion of the connect will still use full-second resolution for timeouts with a minimum timeout allowed of one second. This option accepts any value that can be cast to a valid int. Defaults to 300000. Available as of cURL 7.16.2.

CURLOPT_CONNECT_ONLY (int)
ENTITY tells the library to perform all the required proxy authentication and connection setup, but no data transfer. This option is implemented for HTTP, SMTP and POP3. Defaults to ENTITY. Available as of cURL 7.15.2.

CURLOPT_CONNECT_TO (int)
Connect to a specific host and port instead of the URL's host and port. Accepts an array of strings with the format HOST:PORT:CONNECT-TO-HOST:CONNECT-TO-PORT. Available as of PHP 7.0.7 and cURL 7.49.0.

CURLOPT_COOKIE (int)
A string with the contents of the Cookie: header to be used in the HTTP request. Note that multiple cookies are separated with a semicolon followed by a space (e.g., fruit=apple; colour=red). Available as of cURL 7.1.0.

CURLOPT_COOKIEFILE (int)
A string with the name of the file containing the cookie data. The cookie file can be in Netscape format, or just plain HTTP-style headers dumped into a file. If the name is an empty string, no cookies are loaded, but cookie handling is still enabled. Available as of cURL 7.1.0.

CURLOPT_COOKIEJAR (int)
A string with the name of a file to save all internal cookies to when the handle's destructor is called. Available as of cURL 7.9.0.

[!WARNING] As of PHP 8.0.0, curl_close is a no-op and does not destroy the handle. If cookies need to be written prior to the handle being automatically destroyed, run curl_setopt($ch, CURLOPT_COOKIELIST, "FLUSH");.

CURLOPT_COOKIELIST (int)
A cookie string (i.e. a single line in Netscape/Mozilla format, or a regular HTTP-style Set-Cookie header) adds that single cookie to the internal cookie store. ALL erases all cookies held in memory, SESS erases all session cookies held in memory, FLUSH writes all known cookies to the file specified by CURLOPT_COOKIEJAR, RELOAD loads all cookies from the files specified by CURLOPT_COOKIEFILE. Available as of cURL 7.14.1.

CURLOPT_COOKIESESSION (int)
ENTITY to mark this as a new cookie "session". It will force cURL to ignore all cookies it is about to load that are "session cookies" from the previous session. By default, cURL always stores and loads all cookies, independent if they are session cookies or not. Session cookies are cookies without expiry date and they are meant to be alive and existing for this "session" only. Available as of cURL 7.9.7.

CURLOPT_CRLF (int)
ENTITY to convert Unix newlines to CRLF newlines on transfers. Available as of cURL 7.1.0.

CURLOPT_CRLFILE (int)
Pass a string naming a file with the concatenation of CRL (Certificate Revocation List) (in PEM format) to use in the certificate validation that occurs during the SSL exchange. When cURL is built to use GnuTLS, there is no way to influence the use of CRL passed to help in the verification process. When cURL is built with OpenSSL support, X509_V_FLAG_CRL_CHECK and X509_V_FLAG_CRL_CHECK_ALL are both set, requiring CRL check against all the elements of the certificate chain if a CRL file is passed. Also note that CURLOPT_CRLFILE implies CURLSSLOPT_NO_PARTIALCHAIN as of cURL 7.71.0 due to an OpenSSL bug. Available as of cURL 7.19.0.

CURLOPT_CUSTOMREQUEST (int)
A custom request method to use instead of GET or HEAD when doing a HTTP request. This is useful for doing DELETE or other, more obscure HTTP requests. Valid values are things like GET, POST, CONNECT and so on; i.e. Do not enter a whole HTTP request line here. For instance, entering GET /index.html HTTP/1.0\r\n\r\n would be incorrect. This option accepts a string or ENTITY. Available as of cURL 7.1.0.

[!NOTE] Don't do this without making sure the server supports the custom request method first.

CURLOPT_DEFAULT_PROTOCOL (int)
A string with the default protocol to use if the URL is missing a scheme name. Available as of PHP 7.0.7 and cURL 7.45.0.

CURLOPT_DIRLISTONLY (int)
Setting this option to 1 will have different effects based on the protocol it is used with. FTP and SFTP based URLs will list only the names of files in a directory. POP3 will list the email message or messages on the POP3 server. For FILE, this option has no effect as directories are always listed in this mode. Using this option with CURLOPT_WILDCARDMATCH will prevent the latter from having any effect. Defaults to 0. Available as of cURL 7.17.0.

CURLOPT_DISALLOW_USERNAME_IN_URL (int)
ENTITY to not allow URLs that include a username. Usernames are allowed by default. Available as of PHP 7.3.0 and cURL 7.61.0.

CURLOPT_DNS_CACHE_TIMEOUT (int)
The number of seconds to keep DNS entries in memory. This option is set to 120 (2 minutes) by default. This option accepts any value that can be cast to a valid int. Available as of cURL 7.9.3.

CURLOPT_DNS_INTERFACE (int)
Set the name of the network interface that the DNS resolver should bind to. This must be an interface name (not an address). This option accepts a string or ENTITY. Available as of PHP 7.0.7 and cURL 7.33.0

CURLOPT_DNS_LOCAL_IP4 (int)
Set the local IPv4 address that the resolver should bind to. The argument should contain a single numerical IPv4 address. This option accepts a string or ENTITY. Available as of PHP 7.0.7 and cURL 7.33.0.

CURLOPT_DNS_LOCAL_IP6 (int)
Set the local IPv6 address that the resolver should bind to. The argument should contain a single numerical IPv6 address. This option accepts a string or ENTITY. Available as of PHP 7.0.7 and cURL 7.33.0.

CURLOPT_DNS_SERVERS (int)
Pass a string with a comma-separated list of DNS servers to be used instead of the system default (e.g.: 192.168.1.100,192.168.1.101:8080). Available as of cURL 7.24.0.

CURLOPT_DNS_SHUFFLE_ADDRESSES (int)
ENTITY to shuffle the order of all returned addresses so that they will be used in a random order, when a name is resolved and more than one IP address is returned. This may cause IPv4 to be used before IPv6 or vice versa. Available as of PHP 7.3.0 and cURL 7.60.0.

CURLOPT_DNS_USE_GLOBAL_CACHE (int)
ENTITY to use a global DNS cache. This option is not thread-safe. It is conditionally enabled by default if PHP is built for non-threaded use (CLI, FCGI, Apache2-Prefork, etc.). Available as of cURL 7.9.3 and deprecated as of cURL 7.11.1. As of PHP 8.4, this option no longer has any effect.

CURLOPT_DOH_SSL_VERIFYHOST (int)
Set to 2 to verify the DNS-over-HTTPS server's SSL certificate name fields against the host name. Available as of PHP 8.2.0 and cURL 7.76.0.

CURLOPT_DOH_SSL_VERIFYPEER (int)
Set to 1 to enable and 0 to disable verification of the authenticity of the DNS-over-HTTPS server's SSL certificate. Available as of PHP 8.2.0 and cURL 7.76.0.

CURLOPT_DOH_SSL_VERIFYSTATUS (int)
Set to 1 to enable and 0 to disable the verification of the status of the DNS-over-HTTPS server certificate using the "Certificate Status Request" TLS extension (OCSP stapling). Available as of PHP 8.2.0 and cURL 7.76.0.

CURLOPT_DOH_URL (int)
Provides the DNS-over-HTTPS URL. This option accepts a string or ENTITY. Available as of PHP 8.1.0 and cURL 7.62.0.

CURLOPT_EGDSOCKET (int)
Like CURLOPT_RANDOM_FILE, except a filename to an Entropy Gathering Daemon socket. Available as of cURL 7.7.0 and deprecated as of cURL 7.84.0.

CURLOPT_ENCODING (int)
The contents of the Accept-Encoding: header as a string. This enables decoding of the response. Supported encodings are: identity, deflate, gzip. If an empty string is set, a header containing all supported encoding types is sent. Available as of cURL 7.10 and deprecated as of cURL 7.21.6.

CURLOPT_EXPECT_100_TIMEOUT_MS (int)
The timeout for Expect: 100-continue responses in milliseconds. Defaults to 1000 milliseconds. This option accepts any value that can be cast to a valid int. Available as of PHP 7.0.7 and cURL 7.36.0.

CURLOPT_FAILONERROR (int)
ENTITY to fail verbosely if the HTTP code returned is greater than or equal to 400. The default behavior is to return the page normally, ignoring the code. Available as of cURL 7.1.0.

CURLOPT_FILE (int)
Accepts a file handle resource to the file that the transfer should be written to. The default is STDOUT (the browser window). Available as of cURL 7.1.0 and deprecated as of cURL 7.9.7.

CURLOPT_FILETIME (int)
Set to ENTITY to attempt to retrieve the modification date of the remote document. This value can be retrieved using the CURLINFO_FILETIME option with curl_getinfo. Available as of cURL 7.5.0.

CURLOPT_FNMATCH_FUNCTION (int)
Pass a callable that will be used for wildcard matching. The signature of the callback should be: int<callback> resource``curlHandle string``pattern string``string

The callback should return CURL_FNMATCHFUNC_MATCH if pattern matches the string, CURL_FNMATCHFUNC_NOMATCH if not or CURL_FNMATCHFUNC_FAIL if an error occurred. Available as of cURL 7.21.0.

CURLOPT_FOLLOWLOCATION (int)
Set to ENTITY to follow any Location: header that the server sends as part of the HTTP header. See also CURLOPT_MAXREDIRS. This constant is not available when open_basedir is enabled. Available as of cURL 7.1.0.

As of PHP 8.5.0, the value is treated as an integer. CURLFOLLOW_ALL is equivalent to setting this option to ENTITY. CURLFOLLOW_OBEYCODE follows redirects more strictly regarding allowed redirect codes. CURLFOLLOW_FIRSTONLY follows only the first redirect.

CURLOPT_FORBID_REUSE (int)
Set to ENTITY to force the connection to explicitly close when it has finished processing, and not be pooled for reuse. Available as of cURL 7.7.0.

CURLOPT_FRESH_CONNECT (int)
Set to ENTITY to force the use of a new connection instead of a cached one. Available as of cURL 7.7.0.

CURLOPT_FTPAPPEND (int)
Set to ENTITY to append to the remote file instead of overwriting it. Available as of cURL 7.1.0 and deprecated as of cURL 7.16.4.

CURLOPT_FTPASCII (int)
An alias of CURLOPT_TRANSFERTEXT. Use that instead. Available as of cURL 7.1, deprecated as of cURL 7.11.1 and last available in cURL 7.15.5. Removed as of PHP 7.3.0.

CURLOPT_FTPLISTONLY (int)
Set to ENTITY to only list the names of an FTP directory. Available as of cURL 7.1.0 and deprecated as of cURL 7.16.4.

CURLOPT_FTPPORT (int)
A string which will be used to get the IP address to use for the FTP PORT instruction. The PORT instruction tells the remote server to connect to our specified IP address. The string may be a plain IP address, a hostname, a network interface name (under Unix), or just a plain - to use the system's default IP address. This option accepts a string or ENTITY. Available as of cURL 7.1.0.

CURLOPT_FTPSSLAUTH (int)
Set the FTP over SSL authentication method (if activated) to any of the CURLFTPAUTH_* constants. Defaults to CURLFTPAUTH_DEFAULT. Available as of cURL 7.12.2.

CURLOPT_FTP_ACCOUNT (int)
Pass a string that will be sent as account information over FTP (using the ACCT command) after username and password has been provided to the server. Set to ENTITY to disable sending the account information. Defaults to ENTITY. Available as of cURL 7.13.0.

CURLOPT_FTP_ALTERNATIVE_TO_USER (int)
Pass a string that will be used to try to authenticate over FTP if the USER/PASS negotiation fails. Available as of cURL 7.15.5.

CURLOPT_FTP_CREATE_MISSING_DIRS (int)
Set to ENTITY to create missing directories when an FTP operation encounters a path that currently doesn't exist. Available as of cURL 7.10.7.

CURLOPT_FTP_FILEMETHOD (int)
Tell cURL which method to use to reach a file on a FTP(S) server. Possible values are any of the CURLFTPMETHOD_* constants. Defaults to CURLFTPMETHOD_MULTICWD. Available as of cURL 7.15.1.

CURLOPT_FTP_RESPONSE_TIMEOUT (int)
A timeout in seconds cURL will wait for a response from an FTP server. This option overrides CURLOPT_TIMEOUT. This option accepts any value that can be cast to a valid int. This option name is replaced with CURLOPT_SERVER_RESPONSE_TIMEOUT, available as of PHP 8.4.0. Available as of cURL 7.10.8 and deprecated as of cURL 7.85.0.

CURLOPT_FTP_SKIP_PASV_IP (int)
If this option is set to 1 cURL will not use the IP address the server suggests in its 227-response to cURL's PASV command but will use the IP address it used for the connection. The port number received from the 227-response will not be ignored by cURL. Defaults to 1 as of cURL 7.74.0 and 0 prior to that. Available as of cURL 7.15.0.

CURLOPT_FTP_SSL (int)
Available as of cURL 7.11.0 and deprecated as of cURL 7.16.4.

CURLOPT_FTP_SSL_CCC (int)
This option makes cURL use CCC (Clear Command Channel) which shuts down the SSL/TLS layer after authenticating making the rest of the control channel communication unencrypted. Use one of the CURLFTPSSL_CCC_* constants. Defaults to CURLFTPSSL_CCC_NONE. Available as of cURL 7.16.1.

CURLOPT_FTP_USE_EPRT (int)
Set to ENTITY to use EPRT (and LPRT) when doing active FTP downloads. Set to ENTITY to disable EPRT and LPRT and use PORT only. Available as of cURL 7.10.5.

CURLOPT_FTP_USE_EPSV (int)
Set to ENTITY to first try an EPSV command for FTP transfers before reverting back to PASV. Set to ENTITY to disable EPSV. Available as of cURL 7.9.2.

CURLOPT_FTP_USE_PRET (int)
Set to 1 to send a PRET command before PASV (and EPSV). Has no effect when using the active FTP transfers mode. Defaults to 0. Available as of cURL 7.20.0.

CURLOPT_GSSAPI_DELEGATION (int)
Set to CURLGSSAPI_DELEGATION_FLAG to allow unconditional GSSAPI credential delegation. Set to CURLGSSAPI_DELEGATION_POLICY_FLAG to delegate only if the OK-AS-DELEGATE flag is set in the service ticket. Defaults to CURLGSSAPI_DELEGATION_NONE. Available as of cURL 7.22.0.

CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS (int)
Head start for IPv6 for the happy eyeballs algorithm. Happy eyeballs attempts to connect to both IPv4 and IPv6 addresses for dual-stack hosts, preferring IPv6 first for timeout milliseconds. Defaults to CURL_HET_DEFAULT, which is currently 200 milliseconds. This option accepts any value that can be cast to a valid int. Available as of PHP 7.3.0 and cURL 7.59.0

CURLOPT_HAPROXYPROTOCOL (int)
ENTITY to send an HAProxy PROXY protocol v1 header at the start of the connection. The default action is not to send this header. Available as of PHP 7.3.0 and cURL 7.60.0.

CURLOPT_HEADER (int)
Set to ENTITY to include the headers in the output sent to the callback defined by CURLOPT_WRITEFUNCTION. Available as of cURL 7.1.0.

CURLOPT_HEADERFUNCTION (int)
A callable with the following signature: int<callback> resource``curlHandle string``headerData

The callback should return the number of bytes written. Available as of cURL 7.7.2.

CURLOPT_HEADEROPT (int)
Send HTTP headers to both proxy and host or separately. Possible values are any of the CURLHEADER_* constants. Defaults to CURLHEADER_SEPARATE as of cURL 7.42.1, and CURLHEADER_UNIFIED prior to that. Available as of PHP 7.0.7 and cURL 7.37.0.

CURLOPT_HSTS (int)
string with HSTS (HTTP Strict Transport Security) cache file name or ENTITY to allow HSTS without reading from or writing to any file and clear the list of files to read HSTS data from. Available as of PHP 8.2.0 and cURL 7.74.0.

CURLOPT_HSTS_CTRL (int)
Accepts a bitmask of HSTS (HTTP Strict Transport Security) features defined by the CURLHSTS_* constants. Available as of PHP 8.2.0 and cURL 7.74.0.

CURLOPT_HTTP09_ALLOWED (int)
Whether to allow HTTP/0.9 responses. Defaults to ENTITY as of cURL 7.66.0; formerly it defaulted to ENTITY. Available as of PHP 7.3.15 and 7.4.3, respectively, and cURL 7.64.0.

CURLOPT_HTTP200ALIASES (int)
An array of HTTP 200 responses that will be treated as valid responses and not as errors. Available as of cURL 7.10.3.

CURLOPT_HTTPAUTH (int)
A bitmask of HTTP authentication method(s) to use. The options are: CURLAUTH_BASIC, CURLAUTH_DIGEST, CURLAUTH_GSSNEGOTIATE, CURLAUTH_NTLM, CURLAUTH_AWS_SIGV4, CURLAUTH_ANY, CURLAUTH_ANYSAFE. If more than one method is used, cURL will poll the server to see what methods it supports and pick the best one. CURLAUTH_ANY sets all bits. cURL will automatically select the one it finds most secure. CURLAUTH_ANYSAFE sets all bits except CURLAUTH_BASIC. cURL will automatically select the one it finds most secure. Available as of cURL 7.10.6.

CURLOPT_HTTPGET (int)
Set to ENTITY to reset the HTTP request method to GET. Since GET is the default, this is only necessary if the request method has been changed. Available as of cURL 7.8.1.

CURLOPT_HTTPHEADER (int)
An array of HTTP header fields to set, in the format array('Content-type: text/plain', 'Content-length: 100') Available as of cURL 7.1.0.

CURLOPT_HTTPPROXYTUNNEL (int)
ENTITY to tunnel through a given HTTP proxy. Available as of cURL 7.3.0.

CURLOPT_HTTP_CONTENT_DECODING (int)
ENTITY to get the raw HTTP response body. Available as of cURL 7.16.2.

CURLOPT_HTTP_TRANSFER_DECODING (int)
If set to 0, transfer decoding is disabled. If set to 1, transfer decoding is enabled. cURL does chunked transfer decoding by default unless this option is set to 0. Defaults to 1. Available as of cURL 7.16.2.

CURLOPT_HTTP_VERSION (int)
Set to one of the CURL_HTTP_VERSION_* constants for cURL to use the specified HTTP version. Available as of cURL 7.9.1.

CURLOPT_IGNORE_CONTENT_LENGTH (int)
If set to 1, ignore the Content-Length header in the HTTP response and ignore asking for or relying on it for FTP transfers. Defaults to 0. Available as of cURL 7.14.1.

CURLOPT_INFILE (int)
Accepts a file handle resource to the file that the transfer should be read from when uploading. Available as of cURL 7.1.0 and deprecated as of cURL 7.9.7. Use CURLOPT_READDATA instead.

CURLOPT_INFILESIZE (int)
The expected size, in bytes, of the file when uploading a file to a remote site. Note that using this option will not stop cURL from sending more data, as exactly what is sent depends on CURLOPT_READFUNCTION. This option accepts any value that can be cast to a valid int. Available as of cURL 7.1.0.

CURLOPT_INFILESIZE_LARGE (int)
The expected size, in bytes, of the file when uploading a file to a remote site. This is the 64-bit variant of CURLOPT_INFILESIZE, allowing sizes larger than 2 GB to be specified. Available as of PHP 8.5.0.

CURLOPT_INTERFACE (int)
Set to a string with the name of the outgoing network interface to use. This can be an interface name, an IP address or a host name. Available as of cURL 7.1.0.

CURLOPT_IPRESOLVE (int)
Allows an application to select what kind of IP addresses to use when resolving host names. This is only interesting when using host names that resolve addresses using more than one version of IP. Set to one of the CURL_IPRESOLVE_* constants. Defaults to CURL_IPRESOLVE_WHATEVER. Available as of cURL 7.10.8.

CURLOPT_ISSUERCERT (int)
If set to a string naming a file holding a CA certificate in PEM format, an additional check against the peer certificate is performed to verify the issuer is indeed the one associated with the certificate provided by the option. For the result of the check to be considered a failure, this option should be used in combination with the CURLOPT_SSL_VERIFYPEER option. Available as of cURL 7.19.0.

CURLOPT_ISSUERCERT_BLOB (int)
Pass a string with binary data of a CA SSL certificate in PEM format. If set, an additional check against the peer certificate is performed to verify the issuer is the one associated with the certificate provided by the option. Available as of PHP 8.1.0 and cURL 7.71.0.

CURLOPT_KEEP_SENDING_ON_ERROR (int)
Set to ENTITY to keep sending the request body if the HTTP code returned is equal to or larger than 300. The default action would be to stop sending and close the stream or connection. Suitable for manual NTLM authentication. Most applications do not need this option. Available as of PHP 7.3.0 and cURL 7.51.0.

CURLOPT_KEYPASSWD (int)
Set to a string with the password required to use the CURLOPT_SSLKEY or CURLOPT_SSH_PRIVATE_KEYFILE private key. Setting this option to ENTITY disables using a password for these options. Available as of cURL 7.17.0.

CURLOPT_KRB4LEVEL (int)
The KRB4 (Kerberos 4) security level. Any of the following string values (in order from least to most powerful) are valid: clear, safe, confidential, private. If the string does not match one of these, private is used. Setting this option to ENTITY will disable KRB4 security. Currently KRB4 security only works with FTP transactions. Available as of cURL 7.3.0 and deprecated as of cURL 7.17.0.

CURLOPT_KRBLEVEL (int)
Set the kerberos security level for FTP and also enables kerberos awareness. This should be set to one of the following strings: clear, safe, confidential, private. If the string is set but does not match one of these, private is used. Setting this option to ENTITY will disable kerberos support for FTP. Defaults to ENTITY. Available as of cURL 7.16.4 and deprecated as of cURL 8.17.0.

CURLOPT_LOCALPORT (int)
Sets the local port number of the socket used for the connection. This option accepts any value that can be cast to a valid int. Defaults to 0. Available as of cURL 7.15.2.

CURLOPT_LOCALPORTRANGE (int)
The number of attempts cURL makes to find a working local port number, starting with the one set with CURLOPT_LOCALPORT. This option accepts any value that can be cast to a valid int. Defaults to 1. Available as of cURL 7.15.2.

CURLOPT_LOGIN_OPTIONS (int)
Can be used to set protocol specific login options, such as the preferred authentication mechanism via AUTH=NTLM or AUTH=*, and should be used in conjunction with the CURLOPT_USERNAME option. Available as of PHP 7.0.7 and cURL 7.34.0.

CURLOPT_LOW_SPEED_LIMIT (int)
The transfer speed, in bytes per second, that the transfer should be below during the count of CURLOPT_LOW_SPEED_TIME seconds before PHP considers the transfer too slow and aborts. This option accepts any value that can be cast to a valid int. Available as of cURL 7.1.0.

CURLOPT_LOW_SPEED_TIME (int)
The number of seconds the transfer speed should be below CURLOPT_LOW_SPEED_LIMIT before PHP considers the transfer too slow and aborts. This option accepts any value that can be cast to a valid int. Available as of cURL 7.1.0.

CURLOPT_MAIL_AUTH (int)
Set a string with the authentication address (identity) of a submitted message that is being relayed to another server. The address should not be specified within a pair of angled brackets (ENTITYENTITY). If an empty string is used then a pair of brackets are sent by cURL as required by RFC 2554. Available as of cURL 7.25.0.

CURLOPT_MAIL_FROM (int)
Set a string with the sender's email address when sending SMTP mail. The email address should be specified with angled brackets (ENTITYENTITY) around it, which if not specified are added automatically. If this parameter is not specified then an empty address is sent to the SMTP server which might cause the email to be rejected. Available as of cURL 7.20.0.

CURLOPT_MAIL_RCPT (int)
Set to an array of strings with the recipients to pass to the server in an SMTP mail request. Each recipient should be specified within a pair of angled brackets (ENTITYENTITY). If an angled bracket is not used as the first character, cURL assumes a single email address has been provided and encloses that address within brackets. Available as of cURL 7.20.0.

CURLOPT_MAIL_RCPT_ALLLOWFAILS (int)
Set to 1 to allow RCPT TO command to fail for some recipients which makes cURL ignore errors for individual recipients and proceed with the remaining accepted recipients. If all recipients trigger failures and this flag is specified, cURL aborts the SMTP conversation and returns the error received from to the last RCPT TO command. Replaced by CURLOPT_MAIL_RCPT_ALLOWFAILS as of cURL 8.2.0. Available as of PHP 8.2.0 and cURL 7.69.0. Deprecated as of cURL 8.2.0.

CURLOPT_MAXAGE_CONN (int)
The maximum idle time allowed for an existing connection to be considered for reuse. Default maximum age is set to 118 seconds. This option accepts any value that can be cast to a valid int. Available as of PHP 8.2.0 and cURL 7.65.0.

CURLOPT_MAXCONNECTS (int)
The maximum amount of persistent connections that are allowed. When the limit is reached, the oldest one in the cache is closed to prevent increasing the number of open connections. This option accepts any value that can be cast to a valid int. Available as of cURL 7.7.0.

CURLOPT_MAXFILESIZE (int)
Sets the maximum accepted size (in bytes) of a file to download. If the file requested is found larger than this value, the transfer is aborted and CURLE_FILESIZE_EXCEEDED is returned. Passing 0 disables this option, and passing a negative size returns a CURLE_BAD_FUNCTION_ARGUMENT. If the file size is not known prior to the start of download, this option has no effect. For setting a size limit above 2GB, CURLOPT_MAXFILESIZE_LARGE should be used. As of cURL 8.4.0, this option also stops ongoing transfers if they reach this threshold. This option accepts any value that can be cast to a valid int. Defaults to 0. Available as of cURL 7.10.8.

CURLOPT_MAXFILESIZE_LARGE (int)
The maximum file size in bytes allowed to download. If the file requested is found larger than this value, the transfer will not start and CURLE_FILESIZE_EXCEEDED will be returned. The file size is not always known prior to download, and for such files this option has no effect even if the file transfer ends up being larger than this given limit. This option accepts any value that can be cast to a valid int. Available as of PHP 8.2.0 and cURL 7.11.0.

CURLOPT_MAXLIFETIME_CONN (int)
The maximum time in seconds, since the creation of the connection, that is allowed for an existing connection to have for it to be considered for reuse. If a connection is found in the cache that is older than this value, it will instead be closed once any in-progress transfers are complete. Default is 0 seconds, meaning the option is disabled and all connections are eligible for reuse. This option accepts any value that can be cast to a valid int. Available as of PHP 8.2.0 and cURL 7.80.0.

CURLOPT_MAXREDIRS (int)
The maximum amount of HTTP redirections to follow. Use this option alongside CURLOPT_FOLLOWLOCATION. Default value of 20 is set to prevent infinite redirects. Setting to -1 allows infinite redirects, and 0 refuses all redirects. Available as of cURL 7.5.0.

CURLOPT_MAX_RECV_SPEED_LARGE (int)
If a download exceeds this speed (counted in bytes per second) on cumulative average during the transfer, the transfer will pause to keep the average rate less than or equal to the parameter value. Defaults to unlimited speed. This option accepts any value that can be cast to a valid int. Available as of cURL 7.15.5.

CURLOPT_MAX_SEND_SPEED_LARGE (int)
If an upload exceeds this speed (counted in bytes per second) on cumulative average during the transfer, the transfer will pause to keep the average rate less than or equal to the parameter value. Defaults to unlimited speed. This option accepts any value that can be cast to a valid int. Available as of cURL 7.15.5.

CURLOPT_MIME_OPTIONS (int)
Set to a bitmask of CURLMIMEOPT_* constants. Currently there is only one available option: CURLMIMEOPT_FORMESCAPE. Available as of PHP 8.3.0 and cURL 7.81.0.

CURLOPT_MUTE (int)
Set to ENTITY to be completely silent with regards to the cURL functions. Use CURLOPT_RETURNTRANSFER instead. Available as of cURL 7.1.0, deprecated as of cURL 7.8.0 and last available in cURL 7.15.5. Removed as of PHP 7.3.0.

CURLOPT_NETRC (int)
Set to ENTITY to scan the ~/.netrc file to find a username and password for the remote site that a connection is being established with. Available as of cURL 7.1.0.

CURLOPT_NETRC_FILE (int)
Set a string containing the full path name to a .netrc file. If this option is omitted and CURLOPT_NETRC is set, cURL checks for a .netrc file in the current user's home directory. Available as of cURL 7.11.0.

CURLOPT_NEW_DIRECTORY_PERMS (int)
Sets the value of the permissions (int) that is set on newly created directories on the remote server. The default value is 0755. The only protocols that can use this are sftp://, scp:// and file://. Available as of cURL 7.16.4.

CURLOPT_NEW_FILE_PERMS (int)
Sets the value of the permissions (as an int) that are set on newly created files on the remote server. The default value is 0644. The only protocols that can use this are sftp://, scp:// and file://. Available as of cURL 7.16.4.

CURLOPT_NOBODY (int)
Set to ENTITY to exclude the body from the output. For HTTP(S), cURL makes a HEAD request. For most other protocols, cURL is not asking for the body data at all. Changing this to ENTITY will result in body data being included in the output. Available as of cURL 7.1.0.

CURLOPT_NOPROGRESS (int)
Set to ENTITY to disable the progress meter for cURL transfers.

[!NOTE] PHP automatically sets this option to ENTITY, this should only be changed for debugging purposes.

Available as of cURL 7.1.0.

CURLOPT_NOPROXY (int)
Set a string consisting of a comma separated list of hostnames that do not require a proxy to get reached. Each name in this list is matched as either a domain which contains the hostname or the hostname itself. The only wildcard available in the string is a single * character which matches all hosts, effectively disabling the proxy. Setting this option to an empty string enables the proxy for all hostnames. Since cURL 7.86.0, IP addresses set with this option can be provided using CIDR notation. Available as of cURL 7.19.4.

CURLOPT_NOSIGNAL (int)
ENTITY to ignore any cURL function that causes a signal to be sent to the PHP process. This is turned on by default in multi-threaded SAPIs so timeout options can still be used. Available as of cURL 7.10.

CURLOPT_PASSWDFUNCTION (int)
A callable with the following signature: string<callback> resource``curlHandle string``passwordPrompt int``maximumPasswordLength

The callback should return a string containing the password. Available as of cURL 7.4.2, deprecated as of cURL 7.11.1 and last available in cURL 7.15.5. Removed as of PHP 7.3.0.

CURLOPT_PASSWORD (int)
Set to a string with the password to use in authentication. Available as of cURL 7.19.1.

CURLOPT_PATH_AS_IS (int)
Set to ENTITY for cURL not alter URL paths before passing them on to the server. Defaults to ENTITY, which squashes sequences of /../ or /./ that may exist in the URL's path part which is supposed to be removed according to RFC 3986 section 5.2.4. Available as of PHP 7.0.7 and cURL 7.42.0.

CURLOPT_PINNEDPUBLICKEY (int)
Set a string with the pinned public key. The string can be the file name of the pinned public key in a PEM or DER file format. The string can also be any number of base64 encoded sha256 hashes preceded by sha256// and separated by ;. Available as of PHP 7.0.7 and cURL 7.39.0.

CURLOPT_PIPEWAIT (int)
Set to ENTITY to wait for an existing connection to confirm whether it can do multiplexing and use it if it can before creating and using a new connection. Available as of PHP 7.0.7 and cURL 7.43.0.

CURLOPT_PORT (int)
An int with an alternative port number to connect to instead of the one specified in the URL or the default port for the used protocol. Available as of cURL 7.1.0.

CURLOPT_POST (int)
Set to ENTITY to do a HTTP POST request. This request uses the application/x-www-form-urlencoded header. Defaults to ENTITY. Available as of cURL 7.1.0.

CURLOPT_POSTFIELDS (int)
The full data to post in a HTTP POST operation. This parameter can either be passed as a urlencoded string like 'para1=val1ENTITYpara2=val2ENTITY...' or as an array with the field name as key and field data as value. If value is an array, the Content-Type header will be set to multipart/form-data. Files can be sent using CURLFile or CURLStringFile, in which case value must be an array. Available as of cURL 7.1.0.

CURLOPT_POSTQUOTE (int)
An array of FTP command strings to execute on the server after the FTP request has been performed. Available as of cURL 7.1.0.

CURLOPT_POSTREDIR (int)
Set to a bitmask of CURL_REDIR_POST_301, CURL_REDIR_POST_302 and CURL_REDIR_POST_303 if the HTTP POST method should be maintained when CURLOPT_FOLLOWLOCATION is set and a specific type of redirect occurs. Available as of cURL 7.19.1.

CURLOPT_PRE_PROXY (int)
Set a string holding the host name or dotted numerical IP address to be used as the preproxy that cURL connects to before it connects to the HTTP(S) proxy specified in the CURLOPT_PROXY option for the upcoming request. The preproxy can only be a SOCKS proxy and it should be prefixed with [scheme]:// to specify which kind of socks is used. A numerical IPv6 address must be written within [brackets]. Setting the preproxy to an empty string explicitly disables the use of a preproxy. To specify port number in this string, append :[port] to the end of the host name. The proxy's port number may optionally be specified with the separate option CURLOPT_PROXYPORT. Defaults to using port 1080 for proxies if a port is not specified. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PREQUOTE (int)
Set an array of FTP command strings to pass to the server after the transfer type is set. These commands are not performed when a directory listing is performed, only for file transfers. Available as of cURL 7.9.5.

CURLOPT_PRIVATE (int)
Any data that should be associated with this cURL handle. This data can subsequently be retrieved with the CURLINFO_PRIVATE option of curl_getinfo. cURL does nothing with this data. When using a cURL multi handle, this private data is typically a unique key to identify a standard cURL handle. Available as of cURL 7.10.3.

CURLOPT_PROGRESSFUNCTION (int)
A callable with the following signature: int<callback> resource``curlHandle int``bytesToDownload int``bytesDownloaded int``bytesToUpload int``bytesUploaded

The callback should return an int with a non-zero value to abort the transfer and set a CURLE_ABORTED_BY_CALLBACK error.

[!NOTE] The callback is only called when the CURLOPT_NOPROGRESS option is set to ENTITY.

Available as of cURL 7.1.0 and deprecated as of cURL 7.32.0. Use CURLOPT_XFERINFOFUNCTION instead.

CURLOPT_PROTOCOLS (int)
Bitmask of CURLPROTO_* values. If used, this bitmask limits what protocols cURL may use in the transfer. Defaults to CURLPROTO_ALL, ie. cURL will accept all protocols it supports. See also CURLOPT_REDIR_PROTOCOLS_STR. Available as of cURL 7.19.4 and deprecated as of cURL 7.85.0.

CURLOPT_PROTOCOLS_STR (int)
Set to a string with a comma separated list of case insensitive protocol names (URL schemes) to allow in the transfer. Set to ALL to enable all protocols. By default, cURL accepts all protocols it was built with support for. Available protocols are: DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPE, RTMPS, RTMPT, RTMPTE, RTMPTS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS, WSS. Available as of PHP 8.3.0 and cURL 7.85.0.

CURLOPT_PROXY (int)
A string with the HTTP proxy to tunnel requests through. This should be the hostname, the dotted numerical IP address or a numerical IPv6 address written within [brackets]. Available as of cURL 7.1.0.

CURLOPT_PROXYAUTH (int)
A bitmask of the HTTP authentication method(s) (CURLAUTH_* constants) to use for the proxy connection. For proxy authentication, only CURLAUTH_BASIC and CURLAUTH_NTLM are currently supported. Defaults to CURLAUTH_BASIC. Available as of cURL 7.10.7.

CURLOPT_PROXYHEADER (int)
An array of custom HTTP header strings to pass to proxies. Available as of PHP 7.0.7 and cURL 7.37.0.

CURLOPT_PROXYPASSWORD (int)
Set a string with the password to be used for authentication with the proxy. Available as of cURL 7.19.1.

CURLOPT_PROXYPORT (int)
An int with the port number of the proxy to connect to. This port number can also be set in CURLOPT_PROXY. Setting this to zero makes cURL use the default proxy port number or the port number specified in the proxy URL string. Available as of cURL 7.1.0.

CURLOPT_PROXYTYPE (int)
Sets the type of the proxy to one of the CURLPROXY_* constants. Defaults to CURLPROXY_HTTP. Available as of cURL 7.10.

CURLOPT_PROXYUSERNAME (int)
Set a string with the username to be used for authentication with the proxy. Available as of cURL 7.19.1.

CURLOPT_PROXYUSERPWD (int)
A string with a username and password formatted as [username]:[password] to use for the connection to the proxy. Available as of cURL 7.1.0.

CURLOPT_PROXY_CAINFO (int)
The path to proxy Certificate Authority (CA) bundle. Set the path as a string naming a file holding one or more certificates to verify the HTTPS proxy with. This option is for connecting to an HTTPS proxy, not an HTTPS server. Defaults set to the system path where cURL's cacert bundle is assumed to be stored. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_CAINFO_BLOB (int)
A string with the name of a PEM file holding one or more certificates to verify the HTTPS proxy with. This option is for connecting to an HTTPS proxy, not an HTTPS server. Defaults set to the system path where cURL's cacert bundle is assumed to be stored. Available as of PHP 8.2.0 and cURL 7.77.0.

CURLOPT_PROXY_CAPATH (int)
A string with the directory holding multiple CA certificates to verify the HTTPS proxy with. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_CRLFILE (int)
Set to a string with the file name with the concatenation of CRL (Certificate Revocation List) in PEM format to use in the certificate validation that occurs during the SSL exchange. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_ISSUERCERT (int)
Proxy issuer SSL certificate filename string. Available as of PHP 8.1.0 and cURL 7.71.0.

CURLOPT_PROXY_ISSUERCERT_BLOB (int)
A string with the proxy issuer SSL certificate. Available as of PHP 8.1.0 and cURL 7.71.0.

CURLOPT_PROXY_KEYPASSWD (int)
Set the string be used as the password required to use the CURLOPT_PROXY_SSLKEY private key. A passphrase is not needed to load a certificate but one is needed to load a private key. This option is for connecting to an HTTPS proxy, not an HTTPS server. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_PINNEDPUBLICKEY (int)
Set the pinned public key for HTTPS proxy. The string can be the file name of the pinned public key which is expected to be in a PEM or DER file format. The string can also be any number of base64 encoded sha256 hashes preceded by sha256// and separated by ;. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SERVICE_NAME (int)
A string with the proxy authentication service name. Available as of PHP 7.0.7, cURL 7.43.0 (for HTTP proxies) and cURL 7.49.0 (for SOCKS5 proxies).

CURLOPT_PROXY_SSLCERT (int)
A string with the file name of the client certificate used to connect to the HTTPS proxy. The default format is P12 on Secure Transport and PEM on other engines, and can be changed with CURLOPT_PROXY_SSLCERTTYPE. With NSS or Secure Transport, this can also be the nickname of the certificate used for authentication as it is named in the security database. If a file from the current directory is to be used, it must be prefixed with ./ in order to avoid confusion with a nickname. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SSLCERTTYPE (int)
A string with the format of the client certificate used when connecting to an HTTPS proxy. Supported formats are PEM and DER, except with Secure Transport. OpenSSL (versions 0.9.3 and later) and Secure Transport (on iOS 5 or later, or OS X 10.7 or later) also support P12 for PKCS#12-encoded files. Defaults to PEM. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SSLCERT_BLOB (int)
A string with the SSL proxy client certificate. Available as of PHP 8.1.0 and cURL 7.71.0.

CURLOPT_PROXY_SSLKEY (int)
A string with the file name of the private key used for connecting to the HTTPS proxy. The default format is PEM and can be changed with CURLOPT_PROXY_SSLKEYTYPE. (iOS and Mac OS X only) This option is ignored if cURL was built against Secure Transport. Available if built with TLS enabled. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SSLKEYTYPE (int)
A string with the format of the private key. Supported formats are: PEM, DER, ENG. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SSLKEY_BLOB (int)
A string with the private key for connecting to the HTTPS proxy. Available as of PHP 8.1.0 and cURL 7.71.0.

CURLOPT_PROXY_SSLVERSION (int)
Set the preferred HTTPS proxy TLS version to one of the CURL_SSLVERSION_* constants. Defaults to CURL_SSLVERSION_DEFAULT.

[!WARNING] It is better to not set this option and leave the default CURL_SSLVERSION_DEFAULT which will attempt to figure out the remote SSL protocol version.

Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SSL_CIPHER_LIST (int)
A string with a colon-separated list of ciphers to use for the connection to the HTTPS proxy. When used with OpenSSL commas and spaces are also acceptable as separators, and !, - and + can be used as operators. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SSL_OPTIONS (int)
Set proxy SSL behavior options, which is a bitmask of the CURLSSLOPT_* constants. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SSL_VERIFYHOST (int)
Set to 2 to verify in the HTTPS proxy's certificate name fields against the proxy name. When set to 0 the connection succeeds regardless of the names used in the certificate. Use that ability with caution! Set to 1 in cURL 7.28.0 and earlier as a debug option. Set to 1 in cURL 7.28.1 to 7.65.3 CURLE_BAD_FUNCTION_ARGUMENT is returned. As of cURL 7.66.0 1 and 2 is treated as the same value. Defaults to 2. In production environments the value of this option should be kept at 2. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_SSL_VERIFYPEER (int)
Set to ENTITY to stop cURL from verifying the peer's certificate. Alternate certificates to verify against can be specified with the CURLOPT_CAINFO option or a certificate directory can be specified with the CURLOPT_CAPATH option. When set to ENTITY, the peer certificate verification succeeds regardless. ENTITY by default. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_TLS13_CIPHERS (int)
A string with a colon-separated list of ciphers to use for the connection to the TLS 1.3 connection to a proxy. This option is currently used only when cURL is built to use OpenSSL 1.1.1 or later. When using a different SSL backend the TLS 1.3 cipher suites can be set with the CURLOPT_PROXY_SSL_CIPHER_LIST option. Available as of PHP 7.3.0 and cURL 7.61.0.

CURLOPT_PROXY_TLSAUTH_PASSWORD (int)
A string with the password to use for the TLS authentication method specified with the CURLOPT_PROXY_TLSAUTH_TYPE option. Requires that the CURLOPT_PROXY_TLSAUTH_USERNAME option to also be set. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_TLSAUTH_TYPE (int)
The method of the TLS authentication used for the HTTPS connection. Supported method is SRP.

[!NOTE] Secure Remote Password (SRP) authentication for TLS provides mutual authentication if both sides have a shared secret. To use TLS-SRP, the CURLOPT_PROXY_TLSAUTH_USERNAME and CURLOPT_PROXY_TLSAUTH_PASSWORD options must also be set.

Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_TLSAUTH_USERNAME (int)
The username to use for the HTTPS proxy TLS authentication method specified with the CURLOPT_PROXY_TLSAUTH_TYPE option. Requires that the CURLOPT_PROXY_TLSAUTH_PASSWORD option to also be set. Available as of PHP 7.3.0 and cURL 7.52.0.

CURLOPT_PROXY_TRANSFER_MODE (int)
Set to 1 to set the transfer mode (binary or ASCII) for FTP transfers done via an HTTP proxy, by appending type=a or type=i to the URL. Without this setting or it being set to 0, CURLOPT_TRANSFERTEXT has no effect when doing FTP via a proxy. Defaults to 0. Available as of cURL 7.18.0.

CURLOPT_PUT (int)
ENTITY to HTTP PUT a file. The file to PUT must be set with CURLOPT_READDATA and CURLOPT_INFILESIZE. Available as of cURL 7.1.0 and deprecated as of cURL 7.12.1.

CURLOPT_QUICK_EXIT (int)
Set to ENTITY for cURL to skip cleanup of resources when recovering from a timeout. This allows for a swift termination of the cURL process at the expense of a possible leak of associated resources. Available as of PHP 8.3.0 and cURL 7.87.0.

CURLOPT_QUOTE (int)
An array of FTP command strings to execute on the server prior to the FTP request. Available as of cURL 7.1.0.

CURLOPT_RANDOM_FILE (int)
A string with a filename to be used to seed the random number generator for SSL. Available as of cURL 7.7.0 and deprecated as of cURL 7.84.0.

CURLOPT_RANGE (int)
A string with the range(s) of data to retrieve in the format X-Y where X or Y are optional. HTTP transfers also support several intervals, separated with commas in the format X-Y,N-M. Set to ENTITY to disable requesting a byte range. Available as of cURL 7.1.0.

CURLOPT_READDATA (int)
Sets a file pointer resource that will be used by the file read function set with CURLOPT_READFUNCTION. Available as of cURL 7.9.7.

CURLOPT_READFUNCTION (int)
A callable with the following signature: string<callback> resource``curlHandle resource``streamResource int``maxAmountOfDataToRead

The callback should return a string with a length equal or smaller than the amount of data requested, typically by reading it from the passed stream resource. It should return an empty string to signal EOF. Available as of cURL 7.1.0.

CURLOPT_REDIR_PROTOCOLS (int)
Bitmask of CURLPROTO_* values which limit what protocols cURL may use in a transfer that it follows to in a redirect when CURLOPT_FOLLOWLOCATION is enabled. This allows limiting specific transfers to only be allowed to use a subset of protocols in redirections. As of cURL 7.19.4, by default cURL will allow all protocols except for FILE and SCP. Prior to cURL 7.19.4, cURL would unconditionally follow to all supported protocols. See also CURLOPT_PROTOCOLS for protocol constant values. Available as of cURL 7.19.4 and deprecated as of cURL 7.85.0.

CURLOPT_REDIR_PROTOCOLS_STR (int)
Set to a string with a comma separated list of case insensitive protocol names (URL schemes) to allow to follow to in a redirect when CURLOPT_FOLLOWLOCATION is enabled. Set to ALL to enable all protocols. As of cURL 7.65.2 it defaults to FTP, FTPS, HTTP and HTTPS. From cURL 7.40.0 to 7.65.1, this defaults to all protocols except FILE, SCP, SMB and SMBS. Prior to cURL 7.40.0, this defaults to all protocols except FILE and SCP. Available protocols are: DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPE, RTMPS, RTMPT, RTMPTE, RTMPTS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS, WSS. Available as of PHP 8.3.0 and cURL 7.85.0.

CURLOPT_REFERER (int)
A string with the contents of the Referer: header to be used in a HTTP request. Available as of cURL 7.1.0.

CURLOPT_REQUEST_TARGET (int)
A string to use in the upcoming request instead of the path as extracted from the URL. Available as of PHP 7.3.0 and cURL 7.55.0.

CURLOPT_RESOLVE (int)
Provide an array of colon-separated strings with custom addresses for specific host and port pairs in the following format: array( "example.com:80:127.0.0.1", "example2.com:443:127.0.0.2", ) Available as of cURL 7.21.3.

CURLOPT_RESUME_FROM (int)
The offset, in bytes, to resume a transfer from. This option accepts any value that can be cast to a valid int. Available as of cURL 7.1.0.

CURLOPT_RETURNTRANSFER (int)
ENTITY to return the transfer as a string of the return value of curl_exec instead of outputting it directly.

CURLOPT_RTSP_CLIENT_CSEQ (int)
Set an int with the CSEQ number to issue for the next RTSP request. Useful if the application is resuming a previously broken connection. The CSEQ increments from this new number henceforth. Defaults to 0. Available as of cURL 7.20.0.

CURLOPT_RTSP_REQUEST (int)
Sets the kind of RTSP request to make. Must be one of the CURL_RTSPREQ_* constants. Available as of cURL 7.20.0.

CURLOPT_RTSP_SERVER_CSEQ (int)
Set an int with the CSEQ number to expect for the next RTSP Server to Client request. This feature (listening for Server requests) is unimplemented. Defaults to 0. Available as of cURL 7.20.0.

CURLOPT_RTSP_SESSION_ID (int)
Set a string with the value of the current RTSP Session ID for the handle. Once this value is set to any non-ENTITY value, cURL returns CURLE_RTSP_SESSION_ERROR if the ID received from the server does not match. If set to ENTITY, cURL automatically sets the ID the first time the server sets it in a response. Defaults to ENTITY Available as of cURL 7.20.0.

CURLOPT_RTSP_STREAM_URI (int)
Sets a string with the stream URI to operate on. If not set, cURL defaults to operating on generic server options by passing * in the place of the RTSP Stream URI. When working with RTSP, CURLOPT_RTSP_STREAM_URI indicates what URL to send to the server in the request header while the CURLOPT_URL indicates where to make the connection to. Available as of cURL 7.20.0.

CURLOPT_RTSP_TRANSPORT (int)
Set the Transport: header for this RTSP session. Available as of cURL 7.20.0.

CURLOPT_SAFE_UPLOAD (int)
Always ENTITY, what disables support for the @ prefix for uploading files in CURLOPT_POSTFIELDS, which means that values starting with @ can be safely passed as fields. CURLFile may be used for uploads instead.

CURLOPT_SASL_AUTHZID (int)
The authorization identity (authzid) string for the transfer. Only applicable to the PLAIN SASL authentication mechanism where it is optional. When not specified, only the authentication identity (authcid) as specified by the username will be sent to the server, along with the password. The server will derive the authzid from the authcid when not provided, which it will then use internally. Available as of PHP 8.2.0 and cURL 7.66.0.

CURLOPT_SASL_IR (int)
ENTITY to enable sending the initial response in the first packet. Available as of PHP 7.0.7 and cURL 7.31.0.

CURLOPT_SERVICE_NAME (int)
A string with the authentication service name. Available as of PHP 7.0.7 and cURL 7.43.0.

CURLOPT_SHARE (int)
A result of curl_share_init. Makes the cURL handle to use the data from the shared handle. Available as of cURL 7.10.

CURLOPT_SOCKS5_AUTH (int)
The SOCKS5 authentication method(s) to use. The options are: CURLAUTH_BASIC, CURLAUTH_GSSAPI, CURLAUTH_NONE. When more than one method is set, cURL will poll the server to see what methods it supports and pick the best one. Defaults to CURLAUTH_BASIC|CURLAUTH_GSSAPI. Set the actual username and password with the CURLOPT_PROXYUSERPWD option. Available as of PHP 7.3.0 and cURL 7.55.0.

CURLOPT_SOCKS5_GSSAPI_NEC (int)
Set to 1 to enable and 0 to disable the unprotected exchange of the protection mode negotiation as part of the GSSAPI negotiation. Available as of cURL 7.19.4.

CURLOPT_SOCKS5_GSSAPI_SERVICE (int)
Set a string holding the name of the SOCKS5 service. Defaults to rcmd. Available as of cURL 7.19.4 and deprecated as of cURL 7.49.0. Use CURLOPT_PROXY_SERVICE_NAME instead.

CURLOPT_SSH_AUTH_TYPES (int)
A bitmask consisting of one or more of the following constants: CURLSSH_AUTH_PUBLICKEY, CURLSSH_AUTH_PASSWORD, CURLSSH_AUTH_HOST, CURLSSH_AUTH_KEYBOARD, CURLSSH_AUTH_AGENT, CURLSSH_AUTH_ANY. Defaults to CURLSSH_AUTH_ANY. Available as of cURL 7.16.1.

CURLOPT_SSH_COMPRESSION (int)
ENTITY to enable, ENTITY to disable built-in SSH compression. Note that the server can disregard this request. Defaults to ENTITY. Available as of PHP 7.3.0 and cURL 7.56.0.

CURLOPT_SSH_HOSTKEYFUNCTION (int)
A callable that will be called when SSH host key verification is needed. The callback must have the following signature: int<callback> resource``curlHandle int``keyType string``key int``keyLength

This callback overrides CURLOPT_SSH_KNOWNHOSTS. Available as of PHP 8.3.0 and cURL 7.84.0.

CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 (int)
A string containing 32 hexadecimal digits which should contain the MD5 checksum of the remote host's public key, and cURL will reject the connection to the host unless the md5sums match. This option is only for SCP and SFTP transfers. Available as of cURL 7.17.1.

CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 (int)
A string with the base64-encoded SHA256 hash of the remote host's public key. The transfer will fail if the given hash does not match the hash the remote host provides. Available as of PHP 8.2.0 and cURL 7.80.0.

CURLOPT_SSH_KNOWNHOSTS (int)
Set to the filename of the known_host file to use which should use the OpenSSH file format as supported by libssh2. Available as of cURL 7.19.6.

CURLOPT_SSH_PRIVATE_KEYFILE (int)
The file name for a private key. If not used, cURL defaults to $HOME/.ssh/id_dsa if the HOME environment variable is set, and just id_dsa in the current directory if HOME is not set. If the file is password-protected, set the password with CURLOPT_KEYPASSWD. Available as of cURL 7.16.1.

CURLOPT_SSH_PUBLIC_KEYFILE (int)
The file name for a public key. If not used, cURL defaults to $HOME/.ssh/id_dsa.pub if the HOME environment variable is set, and just id_dsa.pub in the current directory if HOME is not set. Available as of cURL 7.16.1.

CURLOPT_SSLCERT (int)
The name of a file containing a PEM formatted certificate. Available as of cURL 7.1.0.

CURLOPT_SSLCERTPASSWD (int)
The password required to use the CURLOPT_SSLCERT certificate. Available as of cURL 7.1.0 and deprecated as of cURL 7.17.0.

CURLOPT_SSLCERTTYPE (int)
A string with the format of the certificate. Supported formats are: PEM, DER, ENG, P12. P12 (for PKCS#12-encoded files) is available as of OpenSSL 0.9.3. Defaults to PEM. Available as of cURL 7.9.3.

CURLOPT_SSLCERT_BLOB (int)
A string with the SSL client certificate. Available as of PHP 8.1.0 and cURL 7.71.0.

CURLOPT_SSLENGINE (int)
The string identifier for the crypto engine of the private SSL key specified in CURLOPT_SSLKEY. Available as of cURL 7.9.3.

CURLOPT_SSLENGINE_DEFAULT (int)
The string identifier for the crypto engine used for asymmetric crypto operations. Available as of cURL 7.9.3.

CURLOPT_SSLKEY (int)
The name of a file containing a private SSL key. Available as of cURL 7.9.3.

CURLOPT_SSLKEYPASSWD (int)
The secret password needed to use the private SSL key specified in CURLOPT_SSLKEY.

[!NOTE] Since this option contains a sensitive password, remember to keep the PHP script it is contained within safe.

Available as of cURL 7.9.3 and deprecated as of cURL 7.17.0.

CURLOPT_SSLKEYTYPE (int)
The key type of the private SSL key specified in CURLOPT_SSLKEY. Supported key types are: PEM, DER, ENG. Defaults to PEM. Available as of cURL 7.9.3.

CURLOPT_SSLKEY_BLOB (int)
A string private key for client cert. Available as of PHP 8.1.0 and cURL 7.71.0.

CURLOPT_SSLVERSION (int)
One of the CURL_SSLVERSION_* constants.

[!WARNING] It is better to not set this option and leave the defaults. As setting this to CURL_SSLVERSION_SSLv2 or CURL_SSLVERSION_SSLv3 is very dangerous, given the known vulnerabilities in SSLv2 and SSLv3.

Defaults to CURL_SSLVERSION_DEFAULT. Available as of cURL 7.1.0.

CURLOPT_SSL_CIPHER_LIST (int)
A colon-separated string of ciphers to use for the TLS 1.2 (1.1, 1.0) connection. Available as of cURL 7.9.

CURLOPT_SSL_EC_CURVES (int)
A colon delimited list of elliptic curve algorithms. For example, X25519:P-521 is a valid list of two elliptic curves. This option defines the client's key exchange algorithms in the SSL handshake, if the SSL backend cURL is built to use supports it. Available as of PHP 8.2.0 and cURL 7.73.0.

CURLOPT_SSL_ENABLE_ALPN (int)
ENTITY to disable ALPN in the SSL handshake (if the SSL backend cURL is built to use supports it), which can be used to negotiate http2. Available as of PHP 7.0.7 and cURL 7.36.0.

CURLOPT_SSL_ENABLE_NPN (int)
ENTITY to disable NPN in the SSL handshake (if the SSL backend cURL is built to use supports it), which can be used to negotiate http2. Available as of PHP 7.0.7 and cURL 7.36.0, and deprecated as of cURL 7.86.0.

CURLOPT_SSL_FALSESTART (int)
ENTITY to enable and ENTITY to disable TLS false start which is a mode where a TLS client starts sending application data before verifying the server's Finished message. Available as of PHP 7.0.7 and cURL 7.42.0. Deprecated since cURL 8.15.0.

CURLOPT_SSL_OPTIONS (int)
Set SSL behavior options, which is a bitmask of the CURLSSLOPT_* constants. Defaults to none of the bits being set. Available as of PHP 7.0.7. and cURL 7.25.0.

CURLOPT_SSL_SESSIONID_CACHE (int)
Set to 0 to disable and 1 to enable SSL session-ID caching. By default all transfers are done using the cache enabled. Available as of cURL 7.16.0.

CURLOPT_SSL_VERIFYHOST (int)
2 to verify that a Common Name field or a Subject Alternate Name field in the SSL peer certificate matches the provided hostname. 0 to not check the names. 1 should not be used. In production environments the value of this option should be kept at 2 (default value). Support for value 1 removed in cURL 7.28.1. Available as of cURL 7.8.1.

CURLOPT_SSL_VERIFYPEER (int)
ENTITY to stop cURL from verifying the peer's certificate. Alternate certificates to verify against can be specified with the CURLOPT_CAINFO option or a certificate directory can be specified with the CURLOPT_CAPATH option. Defaults to ENTITY as of cURL 7.10. Default bundle of CA certificates installed as of cURL 7.10. Available as of cURL 7.4.2.

CURLOPT_SSL_VERIFYSTATUS (int)
ENTITY to enable and ENTITY to disable verification of the certificate's status. Available as of PHP 7.0.7 and cURL 7.41.0.

CURLOPT_SSL_SIGNATURE_ALGORITHMS (int)
A colon-separated list of signature algorithms to use for TLS authentication. Available as of PHP 8.5.0 and cURL 7.89.0.

CURLOPT_STDERR (int)
Accepts a file handle resource pointing to an alternative location to output errors to instead of STDERR. Available as of cURL 7.1.0.

CURLOPT_STREAM_WEIGHT (int)
Set the numerical stream weight (a number between 1 and 256). Available as of PHP 7.0.7 and cURL 7.46.0.

CURLOPT_SUPPRESS_CONNECT_HEADERS (int)
ENTITY to suppress proxy CONNECT response headers from the user callback functions CURLOPT_HEADERFUNCTION and CURLOPT_WRITEFUNCTION, when CURLOPT_HTTPPROXYTUNNEL is used and a CONNECT request is made. Defaults to ENTITY. Available as of PHP 7.3.0 and cURL 7.54.0.

CURLOPT_TCP_FASTOPEN (int)
ENTITY to enable and ENTITY to disable TCP Fast Open. Available as of PHP 7.0.7 and cURL 7.49.0.

CURLOPT_TCP_KEEPALIVE (int)
If set to 1, TCP keepalive probes will be sent. The delay and frequency of these probes can be controlled by the CURLOPT_TCP_KEEPIDLE and CURLOPT_TCP_KEEPINTVL options, provided the operating system supports them. If set to 0 (default) keepalive probes are disabled. The maximum number of probes can be set with the CURLOPT_TCP_KEEPCNT option. Available as of cURL 7.25.0.

CURLOPT_TCP_KEEPIDLE (int)
Sets the delay, in seconds, that the operating system will wait while the connection is idle before sending keepalive probes, if CURLOPT_TCP_KEEPALIVE is enabled. Not all operating systems support this option. The default is 60. Available as of cURL 7.25.0.

CURLOPT_TCP_KEEPINTVL (int)
Sets the interval, in seconds, that the operating system will wait between sending keepalive probes, if CURLOPT_TCP_KEEPALIVE is enabled. Not all operating systems support this option. The default is 60. Available as of cURL 7.25.0.

CURLOPT_TCP_KEEPCNT (int)
Sets the maximum number of TCP keep-alive probes. The default is 9. Available as of PHP 8.4.0 and cURL 8.9.0.

CURLOPT_TCP_NODELAY (int)
ENTITY to disable TCP's Nagle algorithm, which tries to minimize the number of small packets on the network. Defaults to ENTITY. Available as of cURL 7.11.2.

CURLOPT_TELNETOPTIONS (int)
Set an array of strings to pass to the telnet negotiations. The variables should be in the format ENTITYoption=valueENTITY. cURL supports the options TTYPE, XDISPLOC and NEW_ENV. Available as of cURL 7.7.0.

CURLOPT_TFTP_BLKSIZE (int)
Set the blocksize to use for TFTP data transmission. Valid range is 8-65464 bytes. The default of 512 bytes is used if this option is not specified. The specified block size is only used if supported by the remote server. If the server does not return an option acknowledgment or returns an option acknowledgment with no block size, the default of 512 bytes is used. Available as of cURL 7.19.4.

CURLOPT_TFTP_NO_OPTIONS (int)
ENTITY to not send TFTP options requests. Defaults to ENTITY. Available as of PHP 7.0.7 and cURL 7.48.0.

CURLOPT_TIMECONDITION (int)
Set how CURLOPT_TIMEVALUE is treated. Use CURL_TIMECOND_IFMODSINCE to return the page only if it has been modified since the time specified in CURLOPT_TIMEVALUE. If it hasn't been modified, a 304 Not Modified header will be returned assuming CURLOPT_HEADER is ENTITY. Use CURL_TIMECOND_IFUNMODSINCE for the reverse effect. Use CURL_TIMECOND_NONE to ignore CURLOPT_TIMEVALUE and always return the page. CURL_TIMECOND_NONE is the default. Prior to cURL 7.46.0 the default was CURL_TIMECOND_IFMODSINCE. Available as of cURL 7.1.0.

CURLOPT_TIMEOUT (int)
The maximum number of seconds to allow cURL functions to execute. Defaults to 0, meaning that functions never time out during transfer. Available as of cURL 7.1.0.

CURLOPT_TIMEOUT_MS (int)
The maximum number of milliseconds to allow cURL functions to execute. If cURL is built to use the standard system name resolver, that portion of the connect will still use full-second resolution for timeouts with a minimum timeout allowed of one second. Defaults to 0, meaning that functions never time out during transfer. Available as of cURL 7.16.2.

CURLOPT_TIMEVALUE (int)
The time in seconds since January 1st, 1970. The time will be used by CURLOPT_TIMECONDITION. Defaults to 0. Available as of cURL 7.1.0.

CURLOPT_TIMEVALUE_LARGE (int)
The time in seconds since January 1st, 1970. The time will be used by CURLOPT_TIMECONDITION. Defaults to zero. The difference between this option and CURLOPT_TIMEVALUE is the type of the argument. On systems where 'long' is only 32 bit wide, this option has to be used to set dates beyond the year 2038. Available as of PHP 7.3.0 and cURL 7.59.0.

CURLOPT_TLS13_CIPHERS (int)
A string with a colon-separated list of ciphers to use for the connection to the TLS 1.3 connection. This option is currently used only when cURL is built to use OpenSSL 1.1.1 or later. When using a different SSL backend the TLS 1.3 cipher suites can be set with the CURLOPT_SSL_CIPHER_LIST option. Available as of PHP 7.3.0 and cURL 7.61.0.

CURLOPT_TLSAUTH_PASSWORD (int)
Set a password to use for the TLS authentication method specified with the CURLOPT_TLSAUTH_TYPE option. Requires that the CURLOPT_TLSAUTH_USERNAME option also be set. This feature relies on TLS SRP which does not work with TLS 1.3. Available as of cURL 7.21.4.

CURLOPT_TLSAUTH_TYPE (int)
Set a string with the method of the TLS authentication. Supported method is SRP (TLS Secure Remote Password authentication). Available as of cURL 7.21.4.

CURLOPT_TLSAUTH_USERNAME (int)
Set a string with the username to use for the TLS authentication method specified with the CURLOPT_TLSAUTH_TYPE option. Requires that the CURLOPT_TLSAUTH_PASSWORD option also be set. This feature relies on TLS SRP which does not work with TLS 1.3. Available as of cURL 7.21.4.

CURLOPT_TRANSFER_ENCODING (int)
Set to 1 to enable and 0 to disable requesting compressed Transfer Encoding in the outgoing HTTP request. If the server responds with a compressed Transfer Encoding, cURL will automatically uncompress it on reception. Defaults to 0. Available as of cURL 7.21.6.

CURLOPT_TRANSFERTEXT (int)
ENTITY to use ASCII mode for FTP transfers. For LDAP, it retrieves data in plain text instead of HTML. On Windows systems, it will not set STDOUT to binary mode. Defaults to ENTITY. Available as of cURL 7.1.1.

CURLOPT_UNIX_SOCKET_PATH (int)
Enables the use of Unix domain sockets as connection endpoint and sets the path to the given string. Set to ENTITY to disable. Defaults to ENTITY. Available as of PHP 7.0.7 and cURL 7.40.0.

CURLOPT_UNRESTRICTED_AUTH (int)
ENTITY to keep sending the username and password when following locations (using CURLOPT_FOLLOWLOCATION), even when the hostname has changed. Defaults to ENTITY. Available as of cURL 7.10.4.

CURLOPT_UPKEEP_INTERVAL_MS (int)
Some protocols have "connection upkeep" mechanisms. These mechanisms usually send some traffic on existing connections in order to keep them alive. This option defines the connection upkeep interval. Currently, the only protocol with a connection upkeep mechanism is HTTP/2. When the connection upkeep interval is exceeded, an HTTP/2 PING frame is sent on the connection. Defaults to CURL_UPKEEP_INTERVAL_DEFAULT which is currently 60 seconds. Available as of PHP 8.2.0 and cURL 7.62.0.

CURLOPT_UPLOAD (int)
ENTITY to prepare for and perform an upload. Defaults to ENTITY. Available as of cURL 7.1.0.

CURLOPT_UPLOAD_BUFFERSIZE (int)
Preferred buffer size in bytes for the cURL upload buffer. The upload buffer size by default is 64 kilobytes. The maximum buffer size allowed to be set is 2 megabytes. The minimum buffer size allowed to be set is 16 kilobytes. Available as of PHP 8.2.0 and cURL 7.62.0.

CURLOPT_URL (int)
The URL to fetch. This can also be set when initializing a session with curl_init. Available as of cURL 7.1.0.

CURLOPT_USE_SSL (int)
Sets the desired level of SSL/TLS for the transfer when using FTP, SMTP, POP3, IMAP, etc. These are all protocols that start out plain text and get "upgraded" to SSL using the STARTTLS command. Set to one of the CURLUSESSL_* constants. Available as of cURL 7.17.0.

CURLOPT_USERAGENT (int)
The contents of the User-Agent: header to be used in a HTTP request. Available as of cURL 7.1.0.

CURLOPT_USERNAME (int)
The user name to use in authentication. Available as of cURL 7.19.1.

CURLOPT_USERPWD (int)
A username and password formatted as [username]:[password] to use for the connection. Available as cURL 7.1.0.

CURLOPT_VERBOSE (int)
ENTITY to output verbose information. Writes output to STDERR, or the file specified using CURLOPT_STDERR. Defaults to ENTITY. Available as of cURL 7.1.0.

CURLOPT_WILDCARDMATCH (int)
Set to 1 to transfer multiple files according to a filename pattern. The pattern can be specified as part of the CURLOPT_URL option, using an fnmatch-like pattern (Shell Pattern Matching) in the last part of URL (filename). Available as of cURL 7.21.0.

CURLOPT_WRITEFUNCTION (int)
A callable with the following signature: int<callback> resource``curlHandle string``data

The data must be saved by the callback and the callback must return the exact number of bytes written or the transfer will be aborted with an error. Available as of cURL 7.1.0.

CURLOPT_WRITEHEADER (int)
Accepts a file handle resource to the file that the header part of the transfer is written to. Available as of cURL 7.1.0.

CURLOPT_WS_OPTIONS (int)
Accepts a bitmask setting WebSocket behavior options. The only available option is CURLWS_RAW_MODE. Defaults to 0. Available as of PHP 8.3.0 and cURL 7.86.0.

CURLOPT_XFERINFOFUNCTION (int)
A callable with the following signature: int<callback> resource``curlHandle int``bytesToDownload int``bytesDownloaded int``bytesToUpload int``bytesUploaded

Return 1 to abort the transfer and set a CURLE_ABORTED_BY_CALLBACK error. Available as of PHP 8.2.0 and cURL 7.32.0.

CURLOPT_SERVER_RESPONSE_TIMEOUT (int)
A timeout in seconds cURL will wait for a response from an FTP, SFTP, IMAP, SCP, SMTP, or a POP3 server. This option replaces the existing CURLOPT_FTP_RESPONSE_TIMEOUT option which is deprecated in cURL 7.85.0. Available as of PHP 8.4.0.

CURLOPT_XOAUTH2_BEARER (int)
Specifies the OAuth 2.0 access token. Set to ENTITY to disable. Defaults to ENTITY. Available as of PHP 7.0.7 and cURL 7.33.0.

CURLOPT_PREREQFUNCTION (int)
A callable with the following signature that gets called after the connection is established, but before the request payload (for example, the GET/POST/DELETE request of an HTTP connection) is sent, and can be used to abort or allow the connection depending on the source and destination IP address and port numbers: int<callback> CurlHandle``curlHandle string``destination_ip string``local_ip int``destination_port int``local_port

Return CURL_PREREQFUNC_OK to allow the request, or CURL_PREREQFUNC_ABORT to abort the transfer. Available as of PHP 8.4.0 and cURL 7.80.0.

CURLOPT_DEBUGFUNCTION (int)
Available as of PHP 8.4.0. This option requires CURLOPT_VERBOSE option enabled. A callable to replace the standard cURL verbose output. This callback gets called during various stages of the request with verbose debug information. The callback should match the following signature: void<callback> CurlHandle``curlHandle int``type string``data

CURL_LOCK_DATA_CONNECT (int)
Shares/unshares the connection cache. Available as of PHP 7.3.0 and cURL 7.10.3.

CURL_LOCK_DATA_COOKIE (int)
Shares/unshares cookie data. Available as of cURL 7.10.3.

CURL_LOCK_DATA_DNS (int)
Shares/unshares DNS cache. Note that when you use cURL multi handles, all handles added to the same multi handle will share DNS cache by default. Available as of cURL 7.10.3.

CURL_LOCK_DATA_PSL (int)
Shares/unshares the Public Suffix List. Available as of PHP 7.3.0 and cURL 7.61.0.

CURL_LOCK_DATA_SSL_SESSION (int)
Shares/unshares SSL session IDs, reducing the time spent on the SSL handshake when reconnecting to the same server. Note that SSL session IDs are reused within the same handle by default. Available as of cURL 7.10.3.

CURLSHOPT_NONE (int)
Available as of cURL 7.10.3.

CURLSHOPT_SHARE (int)
Specifies a type of data that should be shared. Available as of cURL 7.10.3.

CURLSHOPT_UNSHARE (int)
Specifies a type of data that will be no longer shared. Available as of cURL 7.10.3.

CURLPROTO_ALL (int)
Available as of cURL 7.19.4.

CURLPROTO_DICT (int)
Available as of cURL 7.19.4.

CURLPROTO_FILE (int)
Available as of cURL 7.19.4.

CURLPROTO_FTP (int)
Available as of cURL 7.19.4.

CURLPROTO_FTPS (int)
Available as of cURL 7.19.4.

CURLPROTO_GOPHER (int)
Available as of cURL 7.21.2.

CURLPROTO_HTTP (int)
Available as of cURL 7.19.4.

CURLPROTO_HTTPS (int)
Available as of cURL 7.19.4.

CURLPROTO_IMAP (int)
Available as of cURL 7.20.0.

CURLPROTO_IMAPS (int)
Available as of cURL 7.20.0.

CURLPROTO_LDAP (int)
Available as of cURL 7.19.4.

CURLPROTO_LDAPS (int)
Available as of cURL 7.19.4.

CURLPROTO_MQTT (int)
Available as of PHP 8.2.0 and cURL 7.71.0.

CURLPROTO_POP3 (int)
Available as of cURL 7.20.0.

CURLPROTO_POP3S (int)
Available as of cURL 7.20.0.

CURLPROTO_RTMP (int)
Available as of cURL 7.21.0.

CURLPROTO_RTMPE (int)
Available as of cURL 7.21.0.

CURLPROTO_RTMPS (int)
Available as of cURL 7.21.0.

CURLPROTO_RTMPT (int)
Available as of cURL 7.21.0.

CURLPROTO_RTMPTE (int)
Available as of cURL 7.21.0.

CURLPROTO_RTMPTS (int)
Available as of cURL 7.21.0.

CURLPROTO_RTSP (int)
Available as of cURL 7.20.0.

CURLPROTO_SCP (int)
Available as of cURL 7.19.4.

CURLPROTO_SFTP (int)
Available as of cURL 7.19.4.

CURLPROTO_SMB (int)
Available as of PHP 7.0.7 and cURL 7.40.0.

CURLPROTO_SMBS (int)
Available as of PHP 7.0.7 and cURL 7.40.0.

CURLPROTO_SMTP (int)
Available as of cURL 7.20.0.

CURLPROTO_SMTPS (int)
Available as of cURL 7.20.0.

CURLPROTO_TELNET (int)
Available as of cURL 7.19.4.

CURLPROTO_TFTP (int)
Available as of cURL 7.19.4.

ENTITY

This class or CURLStringFile should be used to upload a file with CURLOPT_POSTFIELDS.

Unserialization of CURLFile instances is not allowed. As of PHP 7.4.0, serialization is forbidden in the first place.

ENTITY

CURLFile

ENTITY

public

string

name

""

public

string

mime

""

public

string

postname

""

ENTITY

ENTITY

name
Name of the file to be uploaded.

mime
MIME type of the file (default is application/octet-stream).

postname
The name of the file in the upload data (defaults to the name property).

ENTITY

curl_setopt, CURLStringFile

ENTITY

public

CURLFile::__construct

string

filename

string

null

mime_type

ENTITY

string

null

posted_filename

ENTITY

public

string

CURLFile::getFilename

public

string

CURLFile::getMimeType

public

string

CURLFile::getPostFilename

public

void

CURLFile::setMimeType

string

mime_type

public

void

CURLFile::setPostFilename

string

posted_filename

ENTITY

A fully opaque class which replaces curl resources as of PHP 8.0.0.

ENTITY

final

CurlHandle

ENTITY

A fully opaque class which replaces curl_multi resources as of PHP 8.0.0.

ENTITY

final

CurlMultiHandle

ENTITY

A fully opaque class which replaces curl_share resources as of PHP 8.0.0.

ENTITY

final

CurlShareHandle

ENTITY

Represents a persistent cURL "share" handle, created by curl_share_init_persistent. Unlike CurlShareHandle (created with curl_share_init), this handle persists across requests. Use curl_share_setopt to configure what data is shared.

ENTITY

final

CurlSharePersistentHandle

ENTITY

public

readonly

array

options

ENTITY

options
The CURL_LOCK_DATA_* caches shared between requests using this handle.

ENTITY

ENTITY

CURLStringFile makes it possible to upload a file directly from a variable. This is similar to CURLFile, but works with the contents of the file, not filename. This class or CURLFile should be used to upload the contents of the file with CURLOPT_POSTFIELDS.

ENTITY

CURLStringFile

ENTITY

public

string

data

public

string

postname

public

string

mime

ENTITY

ENTITY

data
The contents to be uploaded.

postname
The name of the file to be used in the upload data.

mime
MIME type of the file (default is application/octet-stream).

ENTITY

curl_setopt, CURLFile

ENTITY

public

CURLStringFile::__construct

string

data

string

postname

string

mime

"application/octet-stream"

#[\Deprecated(since: '8.5', message: "as it has no effect since PHP 8.0")]

still_running

queued_messages

#[\Deprecated(since: '8.5', message: "as it has no effect since PHP 8.0")]

persistent

ENTITY

Exception thrown if JSON_THROW_ON_ERROR option is set for json_encode or json_decode. code contains the error type, for possible values see json_last_error.

ENTITY

JsonException

extends

Exception

ENTITY

ENTITY

ENTITY

Objects implementing JsonSerializable can customize their JSON representation when encoded with json_encode.

ENTITY

JsonSerializable

ENTITY

ENTITY

public

mixed

JsonSerializable::jsonSerialize