get_resource_id()

get_resource_id() — Returns an integer identifier for the given resource.

Built-in function of PHP 8.5. The manual lists it as available in PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

What it does

This function provides a type-safe way for generating the integer identifier for a resource.

Signature

get_resource_id(resource $resource): int

Parameters

Return value

The int identifier for the given resource. This function is essentially an int cast of resource to make it easier to retrieve the resource ID.

Example

A runnable snippet:

$handle = fopen("php://stdout", "w"); echo (int) $handle . "\n"; echo get_resource_id($handle);

Output:

698 698

See also

get_resource_type()

All PHP 8.5 built-in functions

Reference card built from the PHP manual page get_resource_id() (PHP documentation, CC BY 3.0). The page is generated from the manual, so the wording of the parameter and return value text follows php.net.