PHP并发之CURL

<?php
$start_time = microtime(true);
$url = array();
for ($i=0;$i<1000;$i++){
    $url[] = "http://www.baidu.com/s?wd=".$i;
}
$header = array();
$result_array = multithread_request($url,$header);
$end_time = microtime(true);

echo $end_time - $start_time.PHP_EOL;

function multithread_request($url,$headers)
{
    //初始化一个curl批处理句柄资源
    $mh = curl_multi_init();
    $headerArr = array();
    foreach( $headers as $n => $v ) {
        $headerArr[] = $n .':' . $v;
    }
    foreach ($url as $i => $value) {
      $conn[$i] = curl_init($url[$i]);
      curl_setopt($conn[$i], CURLOPT_CUSTOMREQUEST, "GET");
      curl_setopt($conn[$i], CURLOPT_SSL_VERIFYPEER, FALSE);
      curl_setopt($conn[$i], CURLOPT_SSL_VERIFYHOST, FALSE);
      curl_setopt($conn[$i], CURLOPT_HTTPHEADER, $headerArr);
      curl_setopt($conn[$i], CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
      curl_setopt($conn[$i], CURLOPT_FOLLOWLOCATION, 1);
      curl_setopt($conn[$i], CURLOPT_AUTOREFERER, 1);
      //curl_setopt($conn[$i], CURLOPT_POST, true );
      //curl_setopt($conn[$i], CURLOPT_POSTFIELDS, $value);
      curl_setopt($conn[$i], CURLOPT_RETURNTRANSFER, true);
      curl_setopt($conn[$i], CURLOPT_HEADER ,0);
//      curl_setopt($conn[$i], CURLOPT_CONNECTTIMEOUT,30);
      curl_setopt($conn[$i], CURLOPT_TIMEOUT, 50);
	  	curl_setopt($conn[$i], CURLOPT_HTTPPROXYTUNNEL, true);
      //log_msg('access',$value);
      curl_multi_add_handle ($mh,$conn[$i]);
    }

    $active = null;
    do {
        $mrc = curl_multi_exec($mh, $active);
    } while ($mrc == CURLM_CALL_MULTI_PERFORM);

    while ($active and $mrc == CURLM_OK) {

        if(curl_multi_select($mh) === -1){
            usleep(100);
        }
        do {
            $mrc = curl_multi_exec($mh, $active);
        } while ($mrc == CURLM_CALL_MULTI_PERFORM);

    }

    $result_array = array();
    foreach ($url as $i => $value) {
      //返回错误
      if(curl_error($conn[$i]))
      {
         //log_msg('error',curl_error($conn[$i]));
      }
      //在设置了CURLOPT_RETURNTRANSFER的情况下，返回获取的输出的文本流
      $result_array[$i] = curl_multi_getcontent($conn[$i]); // 获得返回的数据
      file_put_contents('curl/'.$i.'.html',$result_array[$i]);
    }   

    foreach ($url as $i => $value) {
      curl_multi_remove_handle($mh,$conn[$i]);
      curl_close($conn[$i]);
    }   

    //关闭一个批处理句柄资源
    curl_multi_close($mh);

    return $result_array;
}