PHP 实现抖音去水印

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废话不多说，直接上代码！！！

 1 <?php
 2 $url = $_GET['url'];
 3 //获取视频url
 4 $url = get_redirect_url($url);
 5 //获取视频ID
 6 $str = dirname($url);
 7 $id = substr($str,strripos($str,'video')+6);
 8 //调用抖音官方API
 9 $str = file_get_contents('https://www.douyin.com/web/api/v2/aweme/iteminfo/?item_ids='.$id);
10 //将返回的json数据转为数组
11 $data = json_decode($str,true);
12 //获取有水印的视频地址
13 $url = $data['item_list'][0]['video']['play_addr']['url_list'][0];
14 //将playvm替换为play，从而获取无水印的视频地址
15 $url = str_replace('playwm','play',$url);
16 //获取重定向后的真实地址
17 $video_url = get_redirect_url($url);
18 echo "<a href='$video_url' target='_blank'>$video_url</a>";
19 
20 function get_redirect_url($url) {
21 $ch = curl_init();
22 curl_setopt($ch, CURLOPT_URL, $url);
23 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
24 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
25 curl_setopt($ch, CURLOPT_HTTPHEADER, array(
26 'Accept: */*',
27 'Accept-Encoding: gzip',
28 'Connection: Keep-Alive',
29 'User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)'
30 ));
31 curl_setopt($ch, CURLOPT_HEADER, true);
32 curl_setopt($ch, CURLOPT_NOBODY, 1);
33 curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
34 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
35 $ret = curl_exec($ch);
36 curl_close($ch);
37 preg_match("/Location: (.*?)\r\n/iU",$ret,$location);
38 return $location[1];
39 }

原理可参考：https://baijiahao.baidu.com/s?id=1710928885019968429&wfr=spider&for=pc 

函数可参考：https://blog.csdn.net/weixin_29924799/article/details/116287105

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