$id = $_GET['id'];
// OR
$id = $_REQUEST['id'];
// 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'];
?>
<?php
$url = 'http://username:password@hostname:9090/path?arg=value#anchor';
var_dump(parse_url($url));
var_dump(parse_url($url, PHP_URL_SCHEME));
var_dump(parse_url($url, PHP_URL_USER));
var_dump(parse_url($url, PHP_URL_PASS));
var_dump(parse_url($url, PHP_URL_HOST));
var_dump(parse_url($url, PHP_URL_PORT));
var_dump(parse_url($url, PHP_URL_PATH));
var_dump(parse_url($url, PHP_URL_QUERY));
var_dump(parse_url($url, PHP_URL_FRAGMENT));
?>