is_resource
(PHP 4 , PHP 5)
is_resource --
Finds whether a variable is a resource
Description
bool
is_resource ( mixed var)
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());
}
?>
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See the documentation on the resource-type for
more information.