Wordpress Youtube Thumbnail

wordpress-youtube-thumb.php

<?php
function wordpress_youtube_thumbnail($content){
	preg_match("/v\/([^*]+)/i", $content, $matches);
	$matches[1] = preg_replace("/\?/","&",$matches[1]);
	if($matches[1]=="" || empty($matches[1])){
		preg_match("/watch\?v=([^*]+)/i", $content, $matches);
		$matches[1] = preg_replace("/\?/","&",$matches[1]);
	}
	$images = explode("&",$matches[1]);
	//http://img.youtube.com/vi/bQVoAWSP7k4/1.jpg
	if($images[0] && isset($images[0])){
		return '<img class="alignleft" src="http://img.youtube.com/vi/' . substr($images[0],0,11) . '/2.jpg" alt="' . $thumb->post_title . '" ' . $add . '>';
	}else{
		return false;
	}
}