quote-string
mysqli::quote_string
mysqli_quote_string
Quotes and escapes a string for use in an SQL statement
ENTITY
ENTITY
public
string
mysqli::quote_string
string
string
ENTITY
string
mysqli_quote_string
mysqli
mysql
string
string
Creates a legal SQL string literal that can be used in an SQL statement. The given string is escaped in the same way as mysqli::real_escape_string, taking into account the current character set of the connection, and the result is wrapped in single quotes. The returned value must therefore be inserted into the query without adding any further quotes around it.
Unlike mysqli::real_escape_string, the result is also safe when the NO_BACKSLASH_ESCAPES SQL mode is enabled on the connection.
[!CAUTION] The character set must be set either at the server level, or with the API function
mysqli_set_charsetfor it to affectmysqli_quote_string. See the concepts section on character sets for more information.
[!NOTE] Quoting is only suitable for string literals. It does not make identifiers, such as table or column names, safe. Whenever possible, use prepared statements instead of building queries manually.
ENTITY
string
The string to be quoted and escaped.
Characters encoded are NUL (ASCII 0), \n, \r, \, ', ", and CTRL+Z. If the NO_BACKSLASH_ESCAPES SQL mode is enabled on the connection, only ' is encoded, by doubling it.
ENTITY
Returns the escaped string enclosed in single quotes.
ENTITY
mysqli::quote_string example
ENTITY
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
$city = "'s-Hertogenbosch";
/* this query with quoted $city will work */
$query = sprintf("SELECT CountryCode FROM City WHERE name=%s", $mysqli->quote_string($city));
$result = $mysqli->query($query);
printf("Select returned %d rows.\n", $result->num_rows);
/* this query will fail, because we didn't quote and escape $city */
$query = sprintf("SELECT CountryCode FROM City WHERE name='%s'", $city);
$result = $mysqli->query($query);
ENTITY
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");
$city = "'s-Hertogenbosch";
/* this query with quoted $city will work */
$query = sprintf("SELECT CountryCode FROM City WHERE name=%s", mysqli_quote_string($mysqli, $city));
$result = mysqli_query($mysqli, $query);
printf("Select returned %d rows.\n", mysqli_num_rows($result));
/* this query will fail, because we didn't quote and escape $city */
$query = sprintf("SELECT CountryCode FROM City WHERE name='%s'", $city);
$result = mysqli_query($mysqli, $query);
ENTITY
Select returned 1 rows.
Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 's-Hertogenbosch'' at line 1 in...
ENTITY
mysqli::real_escape_string
mysqli::set_charset
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