is_resource

(PHP 4, PHP 5, PHP 7, PHP 8)

is_resource — Finds whether a variable is a resource

is_resource(mixed $value): bool

Finds whether the given variable is a resource.

Returns true if value is a resource, false otherwise.

Example #1 is_resource() example

<?php

$handle = fopen("php://stdout", "w");
if (is_resource($handle)) {
echo '$handle is a resource';
}

?>

The above example will output:

$handle is a resource

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