php根据网址获取网页标题和描述

namespace xuyaoxiang;		class snoopy {		private $pattern_array=array(	'title'=>'/<title>(\s*.*)<\/title>/i',	'description'=>'/<meta +name="[d|d]escription" +content="(.*)" +\/>/',	'charset'=>'/charset=\"?([\w-]+)\"?/i',	);			public $url;		public $target_code="utf-8"; //目标编码		public $user_agent='mozilla/5.0 (windows nt 10.0; wow64) applewebkit/537.36 (khtml, like gecko) chrome/49.0.2623.110 safari/537.36'; //模拟浏览器头部数据		function __construct($url)	{			$this->url=$url;				}		public function set_pattern($key,$val)	{		if(isset($this->pattern_array[$key])){return false;}		$this->pattern_array[$key]=$val;	} //只能够添加规则,不能更改原有的规则				function get_pege_content($pattern_key)	{						if($pattern_key=='')		{			return false;			}					$curl=curl_init();		// 设置你需要抓取的url			curl_setopt($curl, curlopt_url, $this->url);		// 设置header		curl_setopt($curl, curlopt_header, 0);				// 设置curl 参数，要求结果保存到字符串中还是输出到屏幕上。		curl_setopt($curl, curlopt_returntransfer, 1);				curl_setopt($curl, curlopt_useragent, $this->user_agent);				// 运行curl，请求网页		$data = curl_exec($curl);				if($data==false){return false;} 				preg_match($this->pattern_array['charset'],$data,$reg_charset); //获取网页编码		$page_charset=strtolower($reg_charset[1]);			$charset==$this->target_code || $data=mb_convert_encoding($data,$this->target_code,$page_charset); //如果不符合你设置的编码,进行转码				preg_match($this->pattern_array[$pattern_key],$data,$content); 			// 关闭url请求		curl_close($curl);				return  trim($content[1]);	}}	 $snoopy=new snoopy("http://www.qq.com");		 $title=$snoopy->get_pege_content('title');			 print_r($title);