PHP 实现抖音去水印

<?php
$url = $_GET['url'];
//获取视频url
$url = get_redirect_url($url);
//获取视频ID
$str = dirname($url);
$id = substr($str,strripos($str,'video')+6);
//调用抖音官方API
$str = file_get_contents('https://www.douyin.com/web/api/v2/aweme/iteminfo/?item_ids='.$id);
//将返回的json数据转为数组
$data = json_decode($str,true);
//获取有水印的视频地址
$url = $data['item_list'][0]['video']['play_addr']['url_list'][0];
//将playvm替换为play，从而获取无水印的视频地址
$url = str_replace('playwm','play',$url);
//获取重定向后的真实地址
$video_url = get_redirect_url($url);
echo "<a href='$video_url' target='_blank'>$video_url</a>";

function get_redirect_url($url) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Accept: */*',
'Accept-Encoding: gzip',
'Connection: Keep-Alive',
'User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)'
));
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$ret = curl_exec($ch);
curl_close($ch);
preg_match("/Location: (.*?)\r\n/iU",$ret,$location);
return $location[1];
}