php结合curl实现多线程抓取

<?php
/*
curl 多线程抓取
*/
 /** 
   * curl 多线程 
   * 
   * @param array $array 并行网址 
   * @param int $timeout 超时时光
   * @return array 
   */ 
 function Curl_http($array,$timeout){
 $res = array();
 $mh = curl_multi_init();//创立多个curl语柄
 $startime = getmicrotime();
 foreach($array as $k=>$url){
  $conn[$k]=curl_init($url);

    curl_setopt($conn[$k], CURLOPT_TIMEOUT, $timeout);//设置超时时光
    curl_setopt($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[$k], CURLOPT_HEADER, 0);//这里不要header，加块效力
    curl_setopt($conn[$k], CURLOPT_FOLLOWLOCATION, 1); // 302 redirect
    curl_setopt($conn[$k],CURLOPT_RETURNTRANSFER,1);
    curl_multi_add_handle ($mh,$conn[$k]);
 }
 //避免逝世重复耗逝世cpu 这段是依据网上的写法
 do {
  $mrc = curl_multi_exec($mh,$active);//当无数据，active=true
 } while ($mrc == CURLM_CALL_MULTI_PERFORM);//当正在接收数据时
 while ($active and $mrc == CURLM_OK) {//当无数据时或要求暂停时，active=true
  if (curl_multi_select($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]);//取得返回信息
    $header[$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 
   );

 }
 //盘算当前时光
 function getmicrotime() {
   list($usec, $sec) = explode(" ",microtime());
   return ((float)$usec + (float)$sec);
 }

 //测试一下，curl 三个网址
 $array = array(
  "https://www.weibo.com/",
  "https://www.renren.com/",
  "https://www.qq.com/"
  );
 $data = Curl_http($array,"10");//调用
 var_dump($data);//输出
//如果POST的数据大于1024字节，curl其实不会直接就发起POST要求
//发送要求时，header中包括一个空的Expect。curl_setopt($ch, CURLOPT_HTTPHEADER, array("Expect:"));
?>

<?php
/*