public static function get_info($proxy = false, $i = 0){

        if(empty(self::$id)) die('Enter video id');
        if(!empty(self::$info)) return self::$info;
        # Get video data
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, 'http://www.youtube.com/get_video_info?video_id='. self::$id);
        # Use proxy
        if($proxy && self::$proxy){
            $proxy = self::$proxy_list[($i-1)];
            curl_setopt($ch, CURLOPT_TIMEOUT, 3);
            curl_setopt($ch, CURLOPT_PROXY, trim($proxy));
        }
        curl_setopt($ch, CURLOPT_USERAGENT, self::$user_agent);
        curl_setopt ($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $data = curl_exec ($ch);
        curl_close ($ch);

        # Parsing data
        parse_str($data, $info);

        # Check the returned status and, if necessary, use a proxy
        if(@$info['status'] == 'ok') {
            self::$info = $info;
            return $info;
        }
        elseif($i<self::$proxy_attempts && self::$proxy)
            return self::get_info(true, ++$i);
        else
            return false;
    }

<?php
require 'yt.php';
YT::init('zVAn0d-f5K0');
echo '<pre>';
print_r(YT::get_info());
echo '<br>asda</pre>';
?>

Array
(
    [allow_embed] => 1
    [watermark] => ,http://s.ytimg.com/yts/img/watermark/youtube_watermark-vflHX6b6E.png,http://s.ytimg.com/yts/img/watermark/youtube_hd_watermark-vflAzLcD6.png
    [iurlsd] => http://i3.ytimg.com/vi/zVAn0d-f5K0/sddefault.jpg
    [account_playback_token] => KLV1iZIMpkq9OrKr43Kt_C6JXL98MTM3MDc4OTA1OUAxMzcwNzAyNjU5
    [fmt_list] => 45/1280x720/99/0/0,22/1280x720/9/0/115,44/854x480/99/0/0,35/854x480/9/0/115,43/640x360/99/0/0,34/640x360/9/0/115,18/640x360/9/0/115,5/320x240/7/0/0,36/320x240/99/0/0,17/176x144/99/0/0
    [vq] => auto
    [dash] => 1
    [title] => Заголовок
)