返回文件名videoplayback时下载文件重命名

how to i rename file when link call back videoplayback and title id is $t and url http://www.example.com/api/download.php?id=videoid&itag=tag&t=title back when file save name videoplayback how to i change this name with &t=title i tried this

$id=$_GET['id'];
$itag=$_GET['itag'];
$t=$_GET['t'];
header("Location: " . 'http://example.com/api/'.$id.'/direct/'.$itag.'/'); //this is a redirect code
die();