mysql_ping
(PHP 4 >= 4.3.0, PHP 5)
mysql_ping -- Ping a server connection or reconnect if there is no connection
Description
bool
mysql_ping ( [resource link_identifier])
mysql_ping() 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.
mysql_ping() returns TRUE if the connection to the
server is working, otherwise FALSE.
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);
?>
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See also
mysql_thread_id() and
mysql_list_processes().