本文实例讲述了PHP使用curl并发减少后端访问时间的方法。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，
1、老的curl访问方式以及耗时统计
PHP;">
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
PHP;">
$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
帅气吧整个页面访问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：《》、《》、《》、《》、《》、《》、《》、《》及《PHP常见数据库操作技巧汇总》
希望本文所述对大家PHP程序设计有所帮助。
