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
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并发访问方式以及耗时统计
$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, sohu=>http://www.sohu.com, sina=>http://www.sina.com.cn, );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
http://www.bkjia.com/phpjc/749284.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/749284.htmltecharticle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...