在我们平时的程序中难免出现同时访问几个接口的情况，平时我们用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就要花费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){ $ch
= curl_init(); curl_setopt($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( ); $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并发访问方式以及耗时统计
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<?phpfunction
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( );function
microtime_float(){ list($usec, $sec) = explode(" ", microtime()); return
((float)$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}";?> |
输出结果array(‘taobao‘=>result,‘sina‘=>result,‘baidu‘=>result) ;
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
原文地址：http://www.searchtb.com/2010/12/using-multicurl-to-improve-performance.html?spm=0.0.0.0.onjnnY
利用curl并发来提高页面访问速度,布布扣,bubuko.com
原文：http://www.cnblogs.com/naledao/p/3644806.html