PHP 并发请求 批量请求 Curl

下面代码对 多线程 并发请求，和单线程请求进行了对比，明显多线程快了不少。

<?php
function muti_thread_request($nodes){
$mh = curl_multi_init();
$curl_array = array();
 foreach ($nodes as $i => $url)
{
$curl_array[$i] = curl_init($url);
curl_setopt($curl_array[$i], CURLOPT_RETURNTRANSFER, true);
curl_multi_add_handle($mh, $curl_array[$i]);
}
$running = NULL;
do {
usleep(10000);
curl_multi_exec($mh,$running);
} while($running > 0);
$res = array();
foreach($nodes as $i => $url)
{
$res[$url] = curl_multi_getcontent($curl_array[$i]);
}
foreach($nodes as $i => $url){
curl_multi_remove_handle($mh, $curl_array[$i]);
}
curl_multi_close($mh);
return $res;
}
function culrTest($arr){
forea ch ($arr as $url){
$ch = curl_init();
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
echo "<pre>";
print_r($result);
}
}
$s = microtime(true);
$a = array(
'
'
'
'
'
'
);
print_r(muti_thread_request($a));//9.36s
culrTest($a);//27s
$e = microtime(true);
echo ($e - $s);