is_resource

(PHP 4, PHP 5, PHP 7)

Finds whether a variable is a resource

bool is_resource ( mixed $var )

Finds whether the given variable is a resource.

Parameters:

var

The variable being evaluated.

Returns:

Returns TRUE if var is a resource, FALSE otherwise.

Notes:

is_resource() is not a strict type-checking method: it will return FALSE if var is a resource variable that has been closed.

Examples:

is_resource() example

<?php

$db_link = @mysql_connect('localhost', 'mysql_user', 'mysql_pass');
if (!is_resource($db_link)) {
    die('Can\'t connect : ' . mysql_error());
}

?>