经过URL抓取网页的TITLE，有些网站抓不到，方法愚笨，求指点

<br />public function set_title()<br />	{<br />		// 获取进来URL<br />		$url = $_POST['url'];<br />		// $url = "www.pcauto.com.cn"; 抓不到！<br />		//一连串的curl设置		<br />		$ch = curl_init();<br />		curl_setopt($ch,CURLOPT_URL,$url);<br />		curl_setopt($ch,CURLOPT_HEADER,0);<br />		curl_setopt($ch,CURLOPT_ENCODING,'gzip');<br />		curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);<br />		$content_source = curl_exec($ch);<br />		curl_close($ch);<br />	<br />		//获取抓到内容的编码格式<br /><br />		$encode = mb_detect_encoding($content_source, array('GB2312','GBK','UTF-8','ASCII')); <br />		<br />		//转码<br />		$content_source = iconv($encode, 'utf-8//IGNORE',$content_source);<br />		<br />		//截取<title><br />		if(preg_match("/<title>(.*?)<\/title>/i",$content_source,$title))<br />		{<br />			echo $title[1];<br />		}<br />		else<br />		{<br />			echo '拉取标题失败';<br />		}<br />	}<br />