Outdated Youtube API

ytapi.php

<?php
if (isset($_GET['id'])) {
	$id = trim($_GET['id']);
	parse_str(file_get_contents("http://youtube.com/get_video_info?video_id=".$id),$info);
	$streams = explode(',',$info['url_encoded_fmt_stream_map']);
	$found = false;
	foreach($streams as $stream){
		parse_str($stream,$data);
		if(stripos($data['type'],"video/mp4") !== false){
			$found = true;
			/*if(array_keys($_GET)[1]=="save" ){
				$video = fopen($data['url'].'&signature='.$data['sig'],'r'); //the video
				$file = fopen("yt/".$id.".mp4",'w');
				stream_copy_to_stream($video,$file); //copy it to the file
				fclose($video);
				fclose($file);
				header("location:http://fpsandbox.esy.es/src/yt/".$id.".mp4");
			} else */
			if(array_keys($_GET)[1]=="dl" ){
				header("Cache-Control: public");
				header("Content-Description: File Transfer");
				header("Content-Disposition: attachment; filename=".$id.".mp4");
				header("Content-Type: video/mp4");
				header("Content-Transfer-Encoding: binary");
				readfile($data['url'].'&signature='.$data['sig']);
				exit;
			} else {
			
				header("location:".$data['url'].'&signature='.$data['sig']);
			}
			break;
		}
	}
	if (!$found) {
		header("HTTP/1.0 404 Not Found");
	}
} else {
	header("HTTP/1.1 400 Bad Request");
}






?>