How to get the final address of youku video in php

/**
* Get the final address of youku video
* edit by bbs.it-home.org
* at: 2013-10-2
*/
class YoukuFlv{
    static private $error   =   "";
    static private $result  =   array();

    static public function getYoukuFlv($url){
        //从url获取youkuid
        if(! $id    =   self::getYoukuId($url)){
            return false;
        }
        //获取youku视频详细信息
        $content    =   self::get_curl_contents( "http://v.youku.com/player/getPlayList/VideoIDS/".$id );
        $data   =   json_decode($content);
        if(!isset($data->data[0]->streamfileids)){
            self::$error    =   "Cannot find this video";
            return false;
        }
        foreach($data->data[0]->streamfileids AS $k=>$v){
            if($k == 'flv' || $k == 'mp4'){
                //sid
                $sid=   self::getSid();
                //fileid
                $fileid =   self::getfileid($v,$data->data[0]->seed);
                $one=($data->data[0]->segs->$k);
                self::$result[$k]   = "http://f.youku.com/player/getFlvPath/sid/{$sid}_00/st/{$k}/fileid/{$fileid}?K={$one[0]->k}";
            }
        }
        if(empty(self::$result)){
            self::$error    =   "THIS VIOD IS NOT IN MP4 OR FLV FORMAT";
            return false;
        }else{
            return true;
        }
    }
    static public function error(){
        return self::$error;
    }

    static public function result(){
        return self::$result;
    }

    static private function getYoukuId($url){
        //url 不能为空
        if($url == "" || substr($url , 0 , 29) != "http://v.youku.com/v_show/id_"){
            self::$error    =   "URL IS ERROR";
            return false;
        }
        return substr($url , 29 , -5);
    }

    static private function get_curl_contents($url, $second = 5){
        if(!function_exists('curl_init')) die('php.ini未开启php_curl.dll');
        $c = curl_init();
        curl_setopt($c,CURLOPT_URL,$url);
        $UserAgent=$_SERVER['HTTP_USER_AGENT'];
        curl_setopt($c,CURLOPT_USERAGENT,$UserAgent);
        curl_setopt($c,CURLOPT_HEADER,0);
        curl_setopt($c,CURLOPT_TIMEOUT,$second);
        curl_setopt($c,CURLOPT_RETURNTRANSFER, true);
        $cnt = curl_exec($c);
        curl_close($c);
        return $cnt;
    }
    static private function getSid() {
        $sid = time().(rand(0,9000)+10000);
        return $sid;
    }
    static private function getfileid($fileId,$seed) {
        $mixed = self::getMixString($seed);
        $ids = explode("*",$fileId);
        unset($ids[count($ids)-1]);
        $realId = "";
        for ($i=0;$i < count($ids);++$i) {
            $idx = $ids[$i];
            $realId .= substr($mixed,$idx,1);
        }
        return $realId;
    }
    static private function getMixString($seed) {
        $mixed = "";
        $source = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/\:._-1234567890";
        $len = strlen($source);
        for($i=0;$i< $len;++$i){
            $seed = ($seed * 211 + 30031) % 65536;
            $index = ($seed / 65536 * strlen($source));
            $c = substr($source,$index,1);
            $mixed .= $c;
            $source = str_replace($c, "",$source);
        }
        return $mixed;
    }
}
if(YoukuFlv::getYoukuFlv("http://v.youku.com/v_show/id_XNjEyOTE4NTEy_ev_1.html")){
    print_r( YoukuFlv::result() );
}else{
    echo YoukuFlv::error();
}
?>

另外一种调用方法： http://player.youku.com/player.php/sid/XMjI0MDIwNDc2/v.swf http://player.youku.com/player.php/sid/{$id}/v.swf