這篇文章為大家介紹一下php使用curl並發減少後端存取時間的方法，結合實例形式對比分析了curl使用並發存取前後程式運行耗時。有一定的參考價值，有需要的朋友可以參考一下，希望對大家有幫助。
在我們平時的程式中難免出現同時訪問幾個接口的情況，平時我們用curl進行訪問的時候，一般都是單一、順序訪問，假如有3個接口，每個接口耗時500毫秒那麼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訪問速度，有沒有可能並發訪問來提高速度呢？今天就簡單的說一下，利用curl並發來提高頁面訪問速度，
1、老的curl訪問方式以及耗時統計
<?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 - $time_start;
echo "耗时:{$time}";
?>耗時:0.614秒
2、curl同時存取方式以及耗時統計
<?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 - $time_start;
echo "耗时:{$time}";
?>耗時:0.316秒
帥氣吧整個頁面訪問後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 — alize aurl br/> 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-congets of the current —lhanle_wulti_exec — run the sub-congets of the current —lhanle_lemulti_ 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 curlulti the mhandlem/ulti the mrh/tr. 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
希望本文所述對大家php程式設計有所幫助。
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