MySQL Functions
PHP Manual


(PHP 4, PHP 5)

mysql_closeClose MySQL connection


This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:


bool mysql_close ([ resource $link_identifier = NULL ] )

mysql_close() closes the non-persistent connection to the MySQL server that's associated with the specified link identifier. If link_identifier isn't specified, the last opened link is used.

Open non-persistent MySQL connections and result sets are automatically destroyed when a PHP script finishes its execution. So, while explicitly closing open connections and freeing result sets is optional, doing so is recommended. This will immediately return resources to PHP and MySQL, which can improve performance. For related information, see freeing resources



The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no connection is found or established, an E_WARNING level error is generated.

Return Values

Returns TRUE on success or FALSE on failure.


Example #1 mysql_close() example

if (!
$link) {
'Could not connect: ' mysql_error());
'Connected successfully';

The above example will output:

Connected successfully



mysql_close() will not close persistent links created by mysql_pconnect(). For additional details, see the manual page on persistent connections.

See Also

MySQL Functions
PHP Manual