session-id

session_id

Get and/or set the current session id

ENTITY

string

false

session_id

string

null

id

ENTITY

session_id is used to get or set the session id for the current session.

The constant SID can also be used to retrieve the current name and session id as a string suitable for adding to URLs. See also Session handling.

ENTITY

id
If id is specified and not ENTITY, it will replace the current session id. session_id needs to be called before session_start for that purpose. Depending on the session handler, not all characters are allowed within the session id. For example, the file session handler only allows characters in the range [a-zA-Z0-9,-]!

[!NOTE] When using session cookies, specifying an id for session_id will always send a new cookie when session_start is called, regardless if the current session id is identical to the one being set.

ENTITY

session_id returns the session id for the current session or the empty string ("") if there is no current session (no current session id exists). On failure, ENTITY is returned.

ENTITY

ENTITY

session_regenerate_id, session_start, session_set_save_handler, session.save_handler