Rmdir功能在Linux服务器上不起作用

public function deleteAllEmailRelatedFolders($clientID) {

    $path = getcwd();
    //Delete Email Inbox Attachments
    $dir = $path . "'cdn'data'inbox/$clientID";
    //Delete Email Sent Attachments
    $dir2 = $path . "'cdn'data'sent/$clientID";
    var_dump($dir);
    var_dump($dir2);
    $this->rrmdir($dir);
    $this->rrmdir($dir2);
}
protected function rrmdir($dir) {
    if (is_dir($dir)) {
        $objects = scandir($dir);
        foreach ($objects as $object) {
            if ($object != "." && $object != "..") {
                if (filetype($dir . "/" . $object) == "dir")
                    $this->rrmdir($dir . "/" . $object);
                else
                    unlink($dir . "/" . $object);
            }
        }
        reset($objects);
        rmdir($dir);
    }
}

当我尝试rmdir运行在我的linux。它不能正常工作。当我运行WAMP服务器在我的本地主机。效果很好。请帮我解决这个问题