file_get_contents取得酷狗網頁時，<audio>標籤的src為空

Question

 $urlBefore = "https://www.kugou.com/song/#";
   foreach ($urlData as $key => $value) {
    $url = $urlBefore . "hash=" . $value["hash"] ."&album_id=".$value['album_id'];
    echo $url."<br/&value;";
   $htmlFile =phpQuery::newDocumentFileHTML($ url);
   $title = pq("#myAudio");
   $url0 = pq($title[0])->attr("src");
   print($url0." <br/>");

}

//$url0變數為空，網站原始碼可以取得，但是<audio>標籤的src屬性的值為unknown,這是被屏蔽了嗎，我要如何取得？