is_resource

Description

is_resource() returns TRUE if the variable given by the var parameter is a resource, otherwise it returns FALSE.

Example 1. using is_resource() <?php $db_link = @mysql_connect('localhost', 'mysql_user', 'mysql_pass'); if (!is_resource($db_link)) {     die('Can\'t connect : ' . mysql_error()); } ?>

See the documentation on the resource-type for more information.