Recursive Folders and Subfolders

<?// Initialise empty array, otherwise an error occurs$folders = array();function recursive_subfolders($folders) {    // Set path here    $path = dirname(__FILE__);       // Create initial "Folders" array    if ($dir = opendir($path)) {        $j = 0;        while (($file = readdir($dir)) !== false) {            if ($file != '.' && $file != '..' && is_dir($path.$file)) {                $j++;                $folders[$j] = $path . $file;            }        }    }       closedir($dir);       // Then check each folder in that array for subfolders and add the subfolders to the "Folders" array.    $j = count($folders);    foreach ($folders as $folder) {        if ($dir = opendir($folder)) {            while (($file = readdir($dir)) !== false) {                $pathto = $folder. '/' . $file;                if ($file != '.' && $file != '..' && is_dir($pathto) && !in_array($pathto, $folders)) {                    $j++;                    $folders[$j] = $pathto;                    $folders = recursive_subfolders($folders);                }            }        }        closedir($dir);    }       sort($folders);    return $folders;}$folders = recursive_subfolders($folders);print_r($folders);?>