PHP curl 多线程抓取

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<?php
/*
curl 多线程抓取
*/

 /** 
     * curl 多线程 
     *  
     * @param array $array 并行网址 
     * @param int $timeout 超时时间
     * @return array 
     */ 
 function Curl_http($array,$timeout){
 	$res = array();
 	$mh = curl_multi_init();//创建多个curl语柄
	$startime = getmicrotime();
 	foreach($array as $k=>$url){
 		$conn[$k]=curl_init($url);
 		
        curl_setopt($conn[$k], CURLOPT_TIMEOUT, $timeout);//设置超时时间
        curl_setopt($conn[$k], CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
        curl_setopt($conn[$k], CURLOPT_MAXREDIRS, 7);//HTTp定向级别
        curl_setopt($conn[$k], CURLOPT_HEADER, 0);//这里不要header，加块效率
        curl_setopt($conn[$k], CURLOPT_FOLLOWLOCATION, 1); // 302 redirect
        curl_setopt($conn[$k],CURLOPT_RETURNTRANSFER,1);
        curl_multi_add_handle ($mh,$conn[$k]);
 	}
	 //防止死循环耗死cpu 这段是根据网上的写法
		do {
			$mrc = curl_multi_exec($mh,$active);//当无数据，active=true
		} while ($mrc == CURLM_CALL_MULTI_PERFORM);//当正在接受数据时
		while ($active and $mrc == CURLM_OK) {//当无数据时或请求暂停时，active=true
			if (curl_multi_select($mh) != -1) {
				do {
					$mrc = curl_multi_exec($mh, $active);
				} while ($mrc == CURLM_CALL_MULTI_PERFORM);
			}
		}
 	
 	foreach ($array as $k => $url) {
 		  curl_error($conn[$k]);
    	  $res[$k]=curl_multi_getcontent($conn[$k]);//获得返回信息
    	  $header[$k]=curl_getinfo($conn[$k]);//返回头信息
    	  curl_close($conn[$k]);//关闭语柄
    	  curl_multi_remove_handle($mh  , $conn[$k]);   //释放资源  
		}
		
		curl_multi_close($mh);
		$endtime = getmicrotime();
		$diff_time = $endtime - $startime;
		
		return array('diff_time'=>$diff_time,
					 'return'=>$res,
					'header'=>$header		
					);
 	
 }
 //计算当前时间
 function getmicrotime() {
	    list($usec, $sec) = explode(" ",microtime());
	    return ((float)$usec + (float)$sec);
	}
	
	//测试一下，curl 三个网址
	$array = array(
				"http://www.weibo.com/",
				"http://www.renren.com/",
				"http://www.qq.com/"
				);

	$data = Curl_http($array,'10');//调用
	var_dump($data);//输出
	 
?>