mysql_ping

(PHP 4 >= 4.3.0, PHP 5, PECL mysql:1.0)

mysql_ping — Ping a server connection or reconnect if there is no connection

Description

bool mysql_ping ([ resource $link_identifier ] )

Checks whether or not the connection to the server is working. If it has gone down, an automatic reconnection is attempted. This function can be used by scripts that remain idle for a long while, to check whether or not the server has closed the connection and reconnect if necessary.

Note: Since MySQL 5.0.13, automatic reconnection feature is disabled.

Parameters

link_identifier: The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If by chance no connection is found or established, an E_WARNING level error is generated.

Return Values

Returns TRUE if the connection to the server MySQL server is working, otherwise FALSE.

Examples

Example #1 A mysql_ping() example


<?php

set_time_limit(0);



$conn = mysql_connect('localhost', 'mysqluser', 'mypass');

$db   = mysql_select_db('mydb');



/* Assuming this query will take a long time */

$result = mysql_query($sql);

if (!$result) {

    echo 'Query #1 failed, exiting.';

    exit;

}



/* Make sure the connection is still alive, if not, try to reconnect */

if (!mysql_ping($conn)) {

    echo 'Lost connection, exiting after query #1';

    exit;

}

mysql_free_result($result);



/* So the connection is still alive, let's run another query */

$result2 = mysql_query($sql2);

?>

mysql_ping

Description

Parameters

Return Values

Examples

See Also