hide list of folders from public but let authorised people see with a special url

hide-folder-list-from-public-without-password.php

<?php
/**
 * Hide List of folders from public with php
 * Article url: http://abdulawal.com/hide-list-of-folders-from-public-with-php/
 */
 
$access = $_REQUEST['access'];
if($access == "admin"){
	$dirs = array_filter(glob('*'), 'is_dir');
	echo "<ul>";
	foreach ($dirs as $kw => $val) {
		echo '<li><a href="/'.$val.'">'.$val.'</a></li>';
	}
	echo "</ul>";
} else {
	echo "Sorry! Authorised people Only";
}
?>