LINUX实操：php使用curl并发减少后端访问时间的方法分析

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本文实例讲述了php使用curl并发减少后端拜访时间的方法.分享给大家供大家参考,具体如下：

在我们平时的程序中难免出现同时拜访几个接口的情况,平时我们用curl进行拜访的时候,一般都是单个、顺序拜访,假如有3个接口,每个接口耗时500毫 秒那么我们三个接口就要花费1500毫秒了,这个问题太头疼了严重影响了页面拜访速度,有没有可能并发拜访来提高速度呢?今天就简单的说一下,利用 curl并发来提高页面拜访速度,

1、老的curl拜访方式以及耗时统计

<?php
function curl_fetch($url,$timeout=3){
  $ch = curl_init();
  curl_setopt($ch,CURLOPT_URL,$url);
  curl_setopt($ch,CURLOPT_TIMEOUT,$timeout);
  curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
  $data = curl_exec($ch);
  $errno = curl_errno($ch);
  if ($errno>0) {
    $data = false;
  }
  curl_close($ch);
  return $data;
}
function microtime_float()
{
  list($usec,$sec) = explode(" ",microtime());
  return ((float)$usec + (float)$sec);
}
$url_arr=array(
   "taobao"=>"http://www.taobao.com","sohu"=>"http://www.sohu.com","sina"=>"http://www.sina.com.cn",);
 $time_start = microtime_float();
 $data=array();
 foreach ($url_arr as $key=>$val)
 {
   $data[$key]=curl_fetch($val);
 }
 $time_end = microtime_float();
 $time = $time_end - $time_start;
 echo "耗时:{$time}";
?>

耗时:0.614秒

2、curl并发拜访方式以及耗时统计

<?php
function curl_multi_fetch($urlarr=array()){
  $result=$res=$ch=array();
  $nch = 0;
  $mh = curl_multi_init();
  foreach ($urlarr as $nk => $url) {
    $timeout=2;
    $ch[$nch] = curl_init();
    curl_setopt_array($ch[$nch],array(
    CURLOPT_URL => $url,CURLOPT_HEADER => false,CURLOPT_RETURNTRANSFER => true,CURLOPT_TIMEOUT => $timeout,));
    curl_multi_add_handle($mh,$ch[$nch]);
    ++$nch;
  }
  /* wait for performing request */
  do {
    $mrc = curl_multi_exec($mh,$running);
  } while (CURLM_CALL_MULTI_PERFORM == $mrc);
  while ($running && $mrc == CURLM_OK) {
    // wait for network
    if (curl_multi_select($mh,0.5) > -1) {
      // pull in new data;
      do {
        $mrc = curl_multi_exec($mh,$running);
      } while (CURLM_CALL_MULTI_PERFORM == $mrc);
    }
  }
  if ($mrc != CURLM_OK) {
    error_log("CURL Data Error");
  }
  /* get data */
  $nch = 0;
  foreach ($urlarr as $moudle=>$node) {
    if (($err = curl_error($ch[$nch])) == '') {
      $res[$nch]=curl_multi_getcontent($ch[$nch]);
      $result[$moudle]=$res[$nch];
    }
    else
    {
      error_log("curl error");
    }
    curl_multi_remove_handle($mh,$ch[$nch]);
    curl_close($ch[$nch]);
    ++$nch;
  }
  curl_multi_close($mh);
  return $result;
}
$url_arr=array(
   "taobao"=>"http://www.taobao.com",);
function microtime_float()
{
  list($usec,microtime());
  return ((float)$usec + (float)$sec);
}
$time_start = microtime_float();
$data=curl_multi_fetch($url_arr);
$time_end = microtime_float();
$time = $time_end - $time_start;
 echo "耗时:{$time}";
?>

耗时:0.316秒

帅气吧整个页面拜访后端接口的时间节省了一半

3、curl相关参数

curl_close ― Close a cURL session
curl_copy_handle ― Copy a cURL handle along with all of its preferences
curl_errno ― Return the last error number
curl_error ― Return a string containing the last error for the current session
curl_exec ― Perform a cURL session
curl_getinfo ― Get information regarding a specific transfer
curl_init ― Initialize a cURL session
curl_multi_add_handle ― Add a normal cURL handle to a cURL multi handle
curl_multi_close ― Close a set of cURL handles
curl_multi_exec ― Run the sub-connections of the current cURL handle
curl_multi_getcontent ― Return the content of a cURL handle if CURLOPT_RETURNTRANSFER is set
curl_multi_info_read ― Get information about the current transfers
curl_multi_init ― Returns a new cURL multi handle
curl_multi_remove_handle ― Remove a multi handle from a set of cURL handles
curl_multi_select ― Wait for activity on any curl_multi connection
curl_setopt_array ― Set multiple options for a cURL transfer
curl_setopt ― Set an option for a cURL transfer
curl_version ― Gets cURL version information

更多关于PHP相关内容感兴趣的读者可查看本站专题：《php curl用法总结》、《PHP数组(Array)操作技巧大全》、《PHP数据结构与算法教程》、《PHP数学运算技巧总结》、《php日期与时间用法总结》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所赞助.

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