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小編給大家分享一下php中curl異步并發(fā)請(qǐng)求http的示例，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
先來看下同步的代碼以及請(qǐng)求時(shí)間。
$start_time=date("h:i:sa");
for ($i=0; $i <100 ; $i++) {
$urls[]="http://www.downxia.com/downinfo/2315".$i.".html";
GetTitle(geturl("http://www.downxia.com/downinfo/2315".$i.".html"));
}
function geturl($url){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);
return $output;
}
function GetTitle($output){
preg_match('/<title>.*<\/title>/i',$output,$matches);
var_dump($matches[0]);
}
$end_time=date("h:i:sa");
echo '開始時(shí)間是：'.$start_time;
echo '結(jié)束時(shí)間是：'.$end_time;
最下面可以看到時(shí)間花了27秒。
接下來看下php curl 異步并發(fā)請(qǐng)求http的代碼以及花費(fèi)時(shí)間。
$start_time=date("h:i:sa");
$urls=[];
for ($i=0; $i <100 ; $i++) {
$urls[]="http://www.downxia.com/downinfo/2315".$i.".html";
}
var_dump($urls);
// GetTitle('klasjdkla<title>313asds12</title>');
rolling_curl($urls,'GetTitle');
function GetTitle($output){
preg_match('/<title>.*<\/title>/i',$output,$matches);
var_dump($matches[0]);
}
$end_time=date("h:i:sa");
echo '開始時(shí)間是：'.$start_time;
echo '結(jié)束時(shí)間是：'.$end_time;
function rolling_curl($urls, $callback, $custom_options = null)
{//多個(gè)url訪問
// make sure the rolling window isn't greater than the # of urls
$rolling_window = 5;
$rolling_window = (sizeof($urls) < $rolling_window) ? sizeof($urls) : $rolling_window;
$master = curl_multi_init();
$curl_arr = array();
// add additional curl options here
$std_options = array(
CURLOPT_RETURNTRANSFER => true,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_MAXREDIRS => 5
);
$options = ($custom_options) ? ($std_options + $custom_options) : $std_options;
// start the first batch of requests
for ($i = 0; $i < $rolling_window; $i++) {
$ch = curl_init();
$options[CURLOPT_URL] = $urls[$i];
curl_setopt_array($ch, $options);
curl_multi_add_handle($master, $ch);
}
do {
while (($execrun = curl_multi_exec($master, $running)) == CURLM_CALL_MULTI_PERFORM);
if ($execrun != CURLM_OK) {
break;
}
// a request was just completed -- find out which one
while ($done = curl_multi_info_read($master)) {
$info = curl_getinfo($done['handle']);
if ($info['http_code'] == 200) {
$output = curl_multi_getcontent($done['handle']);
// request successful. process output using the callback function.
$callback($output);
// start a new request (it's important to do this before removing the old one)
$ch = curl_init();
$options[CURLOPT_URL] = $urls[$i++]; // increment i
curl_setopt_array($ch, $options);
curl_multi_add_handle($master, $ch);
// remove the curl handle that just completed
curl_multi_remove_handle($master, $done['handle']);
} else {
// request failed. add error handling.
}
}
} while ($running);
curl_multi_close($master);
return true;
}
才花了3秒？實(shí)際上我感覺應(yīng)該是花了5秒，因?yàn)閱?dòng)比同步要慢，開始的時(shí)候卡了2秒。
http請(qǐng)求效率，毋庸置疑是異步遠(yuǎn)遠(yuǎn)高于同步。
核心請(qǐng)求代碼如下：（這是老外寫的，有點(diǎn)小問題，最后的提示undefined offset）
function rolling_curl($urls, $callback, $custom_options = null)
{//多個(gè)url訪問
// make sure the rolling window isn't greater than the # of urls
$rolling_window = 5;
$rolling_window = (sizeof($urls) < $rolling_window) ? sizeof($urls) : $rolling_window;
$master = curl_multi_init();
$curl_arr = array();
// add additional curl options here
$std_options = array(
CURLOPT_RETURNTRANSFER => true,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_MAXREDIRS => 5
);
$options = ($custom_options) ? ($std_options + $custom_options) : $std_options;
// start the first batch of requests
for ($i = 0; $i < $rolling_window; $i++) {
$ch = curl_init();
$options[CURLOPT_URL] = $urls[$i];
curl_setopt_array($ch, $options);
curl_multi_add_handle($master, $ch);
}
do {
while (($execrun = curl_multi_exec($master, $running)) == CURLM_CALL_MULTI_PERFORM);
if ($execrun != CURLM_OK) {
break;
}
// a request was just completed -- find out which one
while ($done = curl_multi_info_read($master)) {
$info = curl_getinfo($done['handle']);
if ($info['http_code'] == 200) {
$output = curl_multi_getcontent($done['handle']);
// request successful. process output using the callback function.
$callback($output);
// start a new request (it's important to do this before removing the old one)
$ch = curl_init();
$options[CURLOPT_URL] = $urls[$i++]; // increment i
curl_setopt_array($ch, $options);
curl_multi_add_handle($master, $ch);
// remove the curl handle that just completed
curl_multi_remove_handle($master, $done['handle']);
} else {
// request failed. add error handling.
}
}
} while ($running);
curl_multi_close($master);
return true;
}修改一下。只要在新增url的時(shí)候加個(gè)判斷就好了。// 當(dāng)$i等于$urls數(shù)組大小時(shí)不用再增加了。
function rolling_curl($urls, $callback, $custom_options = null)
{//多個(gè)url訪問
// make sure the rolling window isn't greater than the # of urls
$rolling_window = 5;
$rolling_window = (sizeof($urls) < $rolling_window) ? sizeof($urls) : $rolling_window;
$master = curl_multi_init();
$curl_arr = array();
// add additional curl options here
$std_options = array(
CURLOPT_RETURNTRANSFER => true,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_MAXREDIRS => 5
);
$options = ($custom_options) ? ($std_options + $custom_options) : $std_options;
// start the first batch of requests
for ($i = 0; $i < $rolling_window; $i++) {
$ch = curl_init();
$options[CURLOPT_URL] = $urls[$i];
curl_setopt_array($ch, $options);
curl_multi_add_handle($master, $ch);
}
do {
while (($execrun = curl_multi_exec($master, $running)) == CURLM_CALL_MULTI_PERFORM);
if ($execrun != CURLM_OK) {
break;
}
// a request was just completed -- find out which one
while ($done = curl_multi_info_read($master)) {
$info = curl_getinfo($done['handle']);
if ($info['http_code'] == 200) {
$output = curl_multi_getcontent($done['handle']);
// request successful. process output using the callback function.
$callback($output);
// start a new request (it's important to do this before removing the old one)
// 當(dāng)$i等于$urls數(shù)組大小時(shí)不用再增加了
if($i<sizeof($urls)){
$ch = curl_init();
$options[CURLOPT_URL] = $urls[$i++]; // increment i
curl_setopt_array($ch, $options);
curl_multi_add_handle($master, $ch);
}
// remove the curl handle that just completed
curl_multi_remove_handle($master, $done['handle']);
} else {
// request failed. add error handling.
}
}
} while ($running);
curl_multi_close($master);
return true;
}以上是“php中curl異步并發(fā)請(qǐng)求http的示例”這篇文章的所有內(nèi)容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內(nèi)容對(duì)大家有所幫助，如果還想學(xué)習(xí)更多知識(shí)，歡迎關(guān)注億速云行業(yè)資訊頻道！
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