# 方法1和2取一种即可

<?php
    header("Access-Control-Allow-Origin: *");//允许所有地址跨域请求

    //使用方法1（url接收抖音复制链接后的大段文字，自动提取链接）推荐

    $url = $_POST['url']; 
    preg_match_all('/https:\/\/[A-Za-z0-9_.\/]+(\s?)/', $url,$arr);//获取url以空格结尾 
    $yurl = $arr[0][0];
    -------------------------------------------------------------------------------------
    //使用方法2 （直接传url为复制链接内的地址即可，如https://v.douyin.com/RbtKWjm/）
    $yurl = $_POST['url'];
    -------------------------------------------------------------------------------------
    //下面代码公用
    $res = qqxz_http_get($yurl);
    preg_match('/href="(.*?)">Found/', $res, $matches);
    $linkid = substr(str_replace('&', '&', $matches[1]),38,19);
    // preg_match('/itemId: "(.*?)",/', qqxz_http_get(str_replace('&', '&', $matches[1])), $matches);
    $arr = json_decode(qqxz_http_get('https://www.iesdouyin.com/web/api/v2/aweme/iteminfo/?item_ids='. $linkid), true);
    $url = $arr['item_list'][0]["video"]["play_addr"]["url_list"][0];
    include('dy2.html');
 
function qqxz_http_get($url)
{
    $Header=array( "User-Agent:Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1");
    $con=curl_init((string)$url);
    curl_setopt($con,CURLOPT_HEADER,False);
    curl_setopt($con,CURLOPT_SSL_VERIFYPEER,False);
    curl_setopt($con,CURLOPT_RETURNTRANSFER,true);
    curl_setopt($con,CURLOPT_HTTPHEADER,$Header);
    curl_setopt($con,CURLOPT_TIMEOUT,5000);
    $result = curl_exec($con);
    return $result;
}
 
?>

截止发文，亲测可用。