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前端开发中的性能那点事（二）巧用curl 并发减少后端访问时间

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前言：
在我们平时的程序中难免出现同时访问几个接口的情况，而且用老的curl进行访问的时候，一般都是单个、顺序访问，假如有3个接口，每个接口耗时500毫秒那么我们三个接口加起来就是1500毫秒了，这个问题太头疼了，严重影响了页面访问速度，有没有可能并发访问来提高速度呢？今天就简单的说一下，利用curl并发来提高页面访问速度，希望大家多指导。

1、老的curl访问方式以及耗时统计

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function curl_fetch($url, $timeout=3){ 

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    $ch = curl_init(); 

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    curl_setopt($ch, CURLOPT_URL, $url); 

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    curl_setopt($ch, CURLOPT_TIMEOUT, $timeout); 

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    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

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    $data = curl_exec($ch); 

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    $errno = curl_errno($ch); 

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    if ($errno>0) { 

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        $data = false; 

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    } 

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    curl_close($ch); 

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    return $data; 

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} 

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function microtime_float() 

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{ 

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   list($usec, $sec) = explode(" ", microtime()); 

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   return ((float)$usec + (float)$sec); 

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} 

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$url_arr=array( 

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     "taobao"=>"http://www.taobao.com", 

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     "sohu"=>"http://www.sohu.com", 

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     "sina"=>"http://www.sina.com.cn", 

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     ); 

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 $time_start = microtime_float(); 

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 $data=array(); 

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 foreach ($url_arr as $key=>$val) 

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 { 

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     $data[$key]=curl_fetch($val); 

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 } 

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 $time_end = microtime_float(); 

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 $time = $time_end - $time_start; 

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 echo "耗时:{$time}";

耗时:0.614秒

2、curl并发访问方式以及耗时统计

01
function curl_multi_fetch($urlarr=array()){ 

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    $result=$res=$ch=array(); 

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    $nch = 0; 

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    $mh = curl_multi_init(); 

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    foreach ($urlarr as $nk => $url) { 

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        $timeout=2; 

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        $ch[$nch] = curl_init(); 

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        curl_setopt_array($ch[$nch], array( 

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        CURLOPT_URL => $url, 

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        CURLOPT_HEADER => false, 

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        CURLOPT_RETURNTRANSFER => true, 

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        CURLOPT_TIMEOUT => $timeout, 

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        )); 

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        curl_multi_add_handle($mh, $ch[$nch]); 

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        ++$nch; 

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    } 

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    /* wait for performing request */

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    do { 

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        $mrc = curl_multi_exec($mh, $running); 

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    } while (CURLM_CALL_MULTI_PERFORM == $mrc); 

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    while ($running && $mrc == CURLM_OK) { 

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        // wait for network 

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        if (curl_multi_select($mh, 0.5) > -1) { 

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            // pull in new data; 

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            do { 

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                $mrc = curl_multi_exec($mh, $running); 

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            } while (CURLM_CALL_MULTI_PERFORM == $mrc); 

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        } 

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    } 

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    if ($mrc != CURLM_OK) { 

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        error_log("CURL Data Error"); 

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    } 

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    /* get data */

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    $nch = 0; 

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    foreach ($urlarr as $moudle=>$node) { 

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        if (($err = curl_error($ch[$nch])) == '') { 

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            $res[$nch]=curl_multi_getcontent($ch[$nch]); 

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            $result[$moudle]=$res[$nch]; 

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        } 

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        else

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        { 

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            error_log("curl error"); 

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        } 

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        curl_multi_remove_handle($mh,$ch[$nch]); 

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        curl_close($ch[$nch]); 

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        ++$nch; 

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    } 

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    curl_multi_close($mh); 

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    return  $result; 

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} 

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$url_arr=array( 

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     "taobao"=>"http://www.taobao.com", 

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     "sohu"=>"http://www.sohu.com", 

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     "sina"=>"http://www.sina.com.cn", 

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     ); 

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function microtime_float() 

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{ 

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   list($usec, $sec) = explode(" ", microtime()); 

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   return ((float)$usec + (float)$sec); 

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} 

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$time_start = microtime_float(); 

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$data=curl_multi_fetch($url_arr); 

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$time_end = microtime_float(); 

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$time = $time_end - $time_start; 

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 echo "耗时:{$time}";

耗时:0.316秒

帅气吧，整个页面访问后端接口的时间节省了一半！

3、curl相关参数
来自：http://cn2.php.net/manual/en/ref.curl.php
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

4、下期预告：（三）php与opcode缓存

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文章信息

作者：玄悲来源：搜索技术博客－淘宝
标签： curl 并发
发布时间：2010-12-26 21:15:42

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