PHP utility – Rename all file name in folder – Fájl nevek ékezetlenítése, sorköz helyett aláhúzás

<?php

$directory = getcwd();
$i = 1; 
$handler = opendir($directory);
while ($file = readdir($handler)) {
    if ($file != "." && $file != "..") {

    echo $file. "<br>";

$search  = array(' ', 'á', 'é', 'í', 'ó', 'ő', 'ü', 'ű', 'ú',',','ö');
$replace = array('_', 'a', 'e', 'i', 'o', 'o', 'u', 'u', 'u','_','o');

$new_file = str_replace($search, $replace, $file);

        rename($directory."/".$file, $directory."/".$new_file); // here; prepended a $directory

        $i++;
    }
}
closedir($handler);

?>