(PHP 4, PHP 5)
mysql_close — Close 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. Alternatives to this function include:
null to the PDO object
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
link_identifierThe 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.
Example #1 mysql_close() example
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
?>The above example will output:
Connected successfully
Note:
mysql_close() will not close persistent links created by mysql_pconnect(). For additional details, see the manual page on persistent connections.