How to delete directory with PHP on FreeBSD

delete_dir.php

<?php
/* Its been a while since I used this so please use at your own risk */
function deleteDir($dirPath) {
    if (! is_dir($dirPath)) {
        throw new InvalidArgumentException("$dirPath must be a directory");
    }
    if (substr($dirPath, strlen($dirPath) - 1, 1) != '/') {
        $dirPath .= '/';
    }
    $files = glob($dirPath . '*', GLOB_MARK);
    foreach ($files as $file) {
        if (is_dir($file)) {
            self::deleteDir($file);
        } else {
            unlink($file);
        }
    }
    rmdir($dirPath);
}

function changeOwner() {
  $user_name = "username";
  $path = "/path/to/dir";

  //chown($path, $user_name);
  chgrp($path, $user_name);
}
/*deleteDir('/path/to/dir');*/
  changeOwner();
?>