《LINUX實操：php使用curl并發減少后端訪問時間的方法分析》要點：
本文介紹了LINUX實操：php使用curl并發減少后端訪問時間的方法分析，希望對您有用。如果有疑問，可以聯系我們。
本文實例講述了php使用curl并發減少后端拜訪時間的方法.分享給大家供大家參考,具體如下：
在我們平時的程序中難免出現同時拜訪幾個接口的情況,平時我們用curl進行拜訪的時候,一般都是單個、順序拜訪,假如有3個接口,每個接口耗時500毫 秒那么我們三個接口就要花費1500毫秒了,這個問題太頭疼了嚴重影響了頁面拜訪速度,有沒有可能并發拜訪來提高速度呢?今天就簡單的說一下,利用 curl并發來提高頁面拜訪速度,
1、老的curl拜訪方式以及耗時統計
<?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 - $time_start;
echo "耗時:{$time}";
?>
耗時:0.614秒
2、curl并發拜訪方式以及耗時統計
<?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;
}
$url_arr=array(
"taobao"=>"http://www.taobao.com",
"sohu"=>"http://www.sohu.com",
"sina"=>"http://www.sina.com.cn",
);
function microtime_float()
{
list($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 - $time_start;
echo "耗時:{$time}";
?>
耗時:0.316秒
帥氣吧整個頁面拜訪后端接口的時間節省了一半
3、curl相關參數
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
更多關于PHP相關內容感興趣的讀者可查看本站專題：《php curl用法總結》、《PHP數組(Array)操作技巧大全》、《PHP數據結構與算法教程》、《PHP數學運算技巧總結》、《php日期與時間用法總結》、《php面向對象程序設計入門教程》、《php字符串(string)用法總結》、《php+mysql數據庫操作入門教程》及《php常見數據庫操作技巧匯總》
希望本文所述對大家PHP程序設計有所贊助.
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