mysql_ping

• mysql_ping

  Ping a server connection or reconnect if there is no connection

Description

bool mysql_ping(resource link_identifier= =NULL);

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 MariaDB >= 5.0.3.

Parameters

link_identifier

The MariaDB 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 no connection is found or established, an E_WARNING level error is generated.

Return Values

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

Examples

Example 20.59. 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);
?>

See Also

mysql_thread_id

mysql_list_processes

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