is_resource

(PHP 4, PHP 5)

is_resource --  Finds whether a variable is a resource

Beskrivelse

bool is_resource ( mixed var )

Finds whether the given variable is a resource.

Parameterliste

var

The variable being evaluated.

Returneringsværdier

Returns TRUE if var is a resource, FALSE otherwise.

Eksempler

Eksempel 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());
}

?>

Se også

The resource-type documentation
get_resource_type()