public function deleteFolder($dir){
        if(file_exists($dir)){
            $it = new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS);
            $files = new RecursiveIteratorIterator($it,
                         RecursiveIteratorIterator::CHILD_FIRST);
            foreach($files as $file) {
                if ($file->isDir()){
                    rmdir($file->getRealPath());
                } else {
                    unlink($file->getRealPath());
                }
            }
            rmdir($dir);
        }

    }