PHP는 중국어 URL이 포함된 메소드 코드 예제를 어떻게 처리합니까?

// utf-8编码
$url = 'http://ftp.php.cn/PHP视频教程.rar';
//urlencode结果:
echo urlencode($url);
http%3A%2F%2Fftp1.zdy.co%2Fmovie%2F%E6%88%91%E4%B8%BA%E7%9B%B8%E4%BA%B2%E7%8B%82.rmvb
//link_urldecode结果:
echo link_urldecode($url);
http://ftp1.zdy.co/movie/%E6%88%91%E4%B8%BA%E7%9B%B8%E4%BA%B2%E7%8B%82.rmvb
//link_urldecode函数:
function link_urldecode($url) {
  $uri = '';
  $cs = unpack('C*', $url);
  $len = count($cs);
  for ($i=1; $i<=$len; $i++) {
    $uri .= $cs[$i] > 127 ? &#39;%&#39;.strtoupper(dechex($cs[$i])) : $url{$i-1};
  }
  return $uri;
}