how to get the data from url in php code example

Example 1: getting values from url php

$id = $_GET['id'];
// OR

$id = $_REQUEST['id'];

Example 2: php get data from url

// previous link 
<a href="test_get.php?subject=PHP&web=W3schools.com">Test $GET</a>
// the code
<?php
echo "Study " . $_GET['subject'] . " at " . $_GET['web'];
?>