(PHP 4, PHP 5)
is_resource — Finds whether a variable is a resource
Finds whether the given variable is a resource.
The variable being evaluated.
Returns TRUE if var is a resource, FALSE otherwise.
Example#1 is_resource() example
<?php
$db_link = @mysql_connect('localhost', 'mysql_user', 'mysql_pass');
if (!is_resource($db_link)) {
die('Can\'t connect : ' . mysql_error());
}
?>