Get files on server (Recursive function)

functions.php

<?php
$host='http://'.$_SERVER['SERVER_NAME'];
 
function get_files($path,&$files = array()){
global $host;
    $dir = opendir($path."/.");
    while($item = readdir($dir)){
        if(is_file($sub = $path."/".$item)){
                        $file_path = $host.substr( $path, strlen( $_SERVER[ 'DOCUMENT_ROOT' ] )).'/'.$item;
                        $file_info =pathinfo($sub);
            $files[basename($path)][] = array('url'=>$file_path,'ext'=>$file_info['extension']);
                }else{
            if($item != "." and $item != ".."){
                get_files($sub,$files); 
                        }
                }
        }
    return($files);
}
 
$files=get_files(dirname(__FILE__));