<?php

/*
 * TITLE: File renamer
 * AUTHOR: perseusl
 * DESCRIPTION:
 * This renames files in folder recursively
 *
 * HOW TO USE:
 * php multifile_rename.php  <folder> <old_filename> <new_filename>
 */

if($_SERVER['argc'] < 4){
    echo 'Missing parameters!!';
} else {
    $folder = $_SERVER['argv'][1];
    $old_name = $_SERVER['argv'][2];
    $new_name = $_SERVER['argv'][3];

    $folder = (substr($folder, -1) !== '/') ? $folder.'/' : $folder;

    if(is_dir($folder)){
        $folder = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($folder));

        foreach($folder as $name => $object) {
            if(basename($name) === $old_name) {
                $path = substr_replace($name, '', strpos($name, $old_name), strlen($old_name));

                rename($path.$old_name, $path.$new_name);
            }
        }
    } else {
        echo 'Invalid directory! ';
    }
}