Question

Imagine the simple snippet below:

<?
mysql_close();
?>

This will obviously output the following warning (may look different depending on what version of php_mysql(i) you are using):

mysql_close(): no MySQL-Link resource supplied in .....

As there is no link open.

Is there a way in php to test if a mysql link is already established or not?

Thanks!

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Note, have been getting a few comments regarding the use of mysql_close(). I just used that as an example. Furthermore, there are (many) situations when the use of mysql_close() is appropriate.

Answer 1

If you keep track of the resource identifier, you can use if ($link) which will get destroyed if you call mysql_close and then it will no longer evaluate true.