mysql_ping
PHP function
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(PHP 4 >= 4.3.0, PHP 5)
Ping a server connection or reconnect if there is no connection
Note mysqli_ping
Description
mysql_ping(resource $link_identifier = NULL): bool
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
Automatic reconnection is disabled by default in versions of MySQL >= 5.0.3.
Parameters
Return Values
Returns true if the connection to the server MySQL server is working, otherwise false.
Examples
A mysql_ping() example
php
<?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);
?>