Mp3 music randomizer

randomp3.php

<?php
$dir   = './';
$files = scandir($dir);
$list = [];
for ($i = 2; $i < count($files); $i++) {
    $ext = substr($files[$i], -3, 3);
    if ($ext != 'mp3') {
        continue;
    }
    $newName = md5(uniqid()) . '.' . $ext;
    echo $files[$i] . ' > ' . $newName . PHP_EOL;
    rename($files[$i], $newName);
}