/**
 * 删除文件夹
 * @param string $dirname  目录
 * @param bool   $withself 是否删除自身
 * @return boolean
 */
function rmdirs($dirname, $withself = true)
{
    if (!is_dir($dirname)) {
        return false;
    }
    $files = new RecursiveIteratorIterator(
        new RecursiveDirectoryIterator($dirname, RecursiveDirectoryIterator::SKIP_DOTS),
        RecursiveIteratorIterator::CHILD_FIRST
    );

    foreach ($files as $fileinfo) {
        $todo = ($fileinfo->isDir() ? 'rmdir' : 'unlink');
        $todo($fileinfo->getRealPath());
    }
    if ($withself) {
        @rmdir($dirname);
    }
    return true;
}