PHP get_resource_id() Function

The get_resource_id() function is an inbuilt function in PHP that returns the integer id given resource. This function provides a safe way of generating integers for a resource.

Syntax:

get_resource_id($resource) ;

Parameters: This function accepts one parameter that are described below:

• $resource:  Name of the resource for which we want resource id.

Return Value: This function returns the int identifier of the given resource.

Example 1: In the below code example, we will print the id of the given resource.

PHP

<?php

$res = tmpfile() ;

// Print resource id of tmpfile
echo get_resource_id($res);
?>

Output:

4

Example 2: In the below code example, we are opening a text file and then returning his resource id. It may be resource id will be different according to your computer.

PHP

<?php
$res = fopen("text.txt", "rb");
echo get_resource_id($res);
?>

Output:

5

Reference: https://www.php.net/manual/en/function.get-resource-id.php