curl 多线程抓取

php$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($data);//输出
//如果POST的数据大于1024字节，curl并不会直接就发起POST请求
//发送请求时，header中包含一个空的Expect。curl_setopt($ch, CURLOPT_HTTPHEADER, array("Expect:"));
?>

curl 多线程抓取