解析获取优酷视频真实下载地址的PHP源代码

<?php

//--调用方法/demo.php?url=http://v.youku.com/v_show/id_XMzkyODA2NTEy.html

echo getYoukuFlv($_GET['url']);

function getYoukuFlv($url){

preg_match("#id_(.*?).html#",$url,$out);

$id=$out[1];

$content=get_curl_contents('http://v.youku.com/player/getPlayList/VideoIDS/'.$id);

$data=json_decode($content);

foreach($data->data[0]->streamfileids AS $k=>$v){

$sid=getSid();

$fileid=getfileid($v,$data->data[0]->seed);

$one=($data->data[0]->segs->$k);

if($k == 'flv' || $k == 'mp4') return "http://f.youku.com/player/getFlvPath/sid/{$sid}_00/st/{$k}/fileid/{$fileid}?K={$one[0]->k}";

continue;

}

}

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);

$cnt=mb_check_encoding($cnt,'utf-8')?iconv('gbk','utf-8//IGNORE',$cnt):$cnt; //字符编码转换

curl_close($c);

return $cnt;

}

function getSid() {

$sid = time().(rand(0,9000)+10000);

return $sid;

}

function getkey($key1,$key2){

$a = hexdec($key1);

$b = $a ^ 0xA55AA5A5;

$b = dechex($b);

return $key2.$b;

}

function getfileid($fileId,$seed) {

$mixed = getMixString($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;

}

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;

}

?>