推荐：《PHP视频教程》
先来看下同步的代码以及请求时间。
$start_time=date("h:i:sa");
for ($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>/i',$output,$matches);
var_dump($matches[0]);
}
$end_time=date("h:i:sa");
echo '开始时间是：'.$start_time;
echo '结束时间是：'.$end_time;</pre><p><img alt="" class="has" src="https://img.php.cn/upload/article/000/000/020/f3308981971ab2270c03dc7d2f94fb4b-0.jpg"></p>
<p>最下面可以看到时间花了27秒。</p>
<p>接下来看下<a style="color:#f60; text-decoration:underline;" title="php" href="https://www.php.cn/zt/15714.html" target="_blank">php</a> <a style="color:#f60; text-decoration:underline;" title="curl" href="https://www.php.cn/zt/17285.html" target="_blank">curl</a> 异步并发请求http的代码以及花费时间。</p><pre class="brush:php;toolbar:false;">$start_time=date("h:i:sa");
$urls=[];
for ($i=0; $i <100 ; $i++) {
$urls[]="http://www.downxia.com/downinfo/2315".$i.".html";
}
var_dump($urls);
// GetTitle('klasjdkla<title>313asds12 ');
rolling_curl($urls,'GetTitle');
function GetTitle($output){
preg_match('/.*<\/title>/i',$output,$matches);
var_dump($matches[0]);
}
$end_time=date("h:i:sa");
echo '开始时间是：'.$start_time;
echo '结束时间是：'.$end_time;
function rolling_curl($urls, $callback, $custom_options = null)
{//多个url访问
// 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($master);
return true;
}</pre><p><img alt="" class="has" src="https://img.php.cn/upload/article/000/000/020/f3308981971ab2270c03dc7d2f94fb4b-1.jpg"></p>
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<p>才花了3秒？实际上我感觉应该是花了5秒，因为启动比同步要慢，开始的时候卡了2秒。</p><div class="aritcle_card flexRow">
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<p>http请求效率，毋庸置疑是异步远远高于同步。</p>
<p>核心请求代码如下：（这是老外写的，有点小问题，最后的提示undefined offset）</p><pre class="brush:php;toolbar:false;">function rolling_curl($urls, $callback, $custom_options = null)
{//多个url访问
// 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($master);
return true;
}</pre><p>修改一下。只要在新增url的时候加个判断就好了。// 当$i等于$urls数组大小时不用再增加了。</p><pre class="brush:php;toolbar:false;">function rolling_curl($urls, $callback, $custom_options = null)
{//多个url访问
// 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)
// 当$i等于$urls数组大小时不用再增加了
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;
}</pre><p>以上，结束。记录一下，以免自己忘记。</p> </div>
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