$data = '<embed src="http://www.site.com/player.swf" flashvars="file=http://video.ak.facebook.com/cfs-ak-ash2/33228/726/103804976336640_20960.mp4&logo=http://www.http://www.site.com/img/player.png&skin=http://www.http://www.site.com/snel/snel.swf" width="570" height="450" allowfullscreen="true"/>';
$veri = explode('<embed src="http://www.site.com/player.swf" flashvars="file=', $data);
$veri = explode('&logo', $veri[1]);
echo $veri[0];