Example of how PHP uses curl_multi to implement concurrent requests

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The examples in this article describe PHP Use curl_multi to implement concurrent requests. Share it with everyone for your reference, the details are as follows:

class CurlMultiUtil { /** * 根据url,postData获取curl请求对象,这个比较简单,可以看官方文档 */ private static function getCurlObject($url,$postData=array(),$header=array()){ $options = array(); $url = trim($url); $options[CURLOPT_URL] = $url; $options[CURLOPT_TIMEOUT] = 3; $options[CURLOPT_RETURNTRANSFER] = true; foreach($header as $key=>$value){ $options[$key] =$value; } if(!empty($postData) && is_array($postData)){ $options[CURLOPT_POST] = true; $options[CURLOPT_POSTFIELDS] = http_build_query($postData); } if(stripos($url,'https') === 0){ $options[CURLOPT_SSL_VERIFYPEER] = false; } $ch = curl_init(); curl_setopt_array($ch,$options); return $ch; } /** * [request description] * @param [type] $chList * @return [type] */ private static function request($chList){ $downloader = curl_multi_init(); // 将三个待请求对象放入下载器中 foreach ($chList as $ch){ curl_multi_add_handle($downloader,$ch); } $res = array(); // 轮询 do { while (($execrun = curl_multi_exec($downloader, $running)) == CURLM_CALL_MULTI_PERFORM); if ($execrun != CURLM_OK) { break; } // 一旦有一个请求完成，找出来，处理,因为curl底层是select，所以最大受限于1024 while ($done = curl_multi_info_read($downloader)){ // 从请求中获取信息、内容、错误 // $info = curl_getinfo($done['handle']); $output = curl_multi_getcontent($done['handle']); // $error = curl_error($done['handle']); $res[] = $output; // 把请求已经完成了得 curl handle 删除 curl_multi_remove_handle($downloader, $done['handle']); } // 当没有数据的时候进行堵塞，把 CPU 使用权交出来，避免上面 do 死循环空跑数据导致 CPU 100% if ($running) { $rel = curl_multi_select($downloader, 1); if($rel == -1){ usleep(1000); } } if($running == false){ break; } }while(true); curl_multi_close($downloader); return $res; } /** * [get description] * @param [type] $urlArr * @return [type] */ public static function get($urlArr){ $data = array(); if (!empty($urlArr)) { $chList = array(); foreach ($urlArr as $key => $url) { $chList[] = self::getCurlObject($url); } $data = self::request($chList); } return $data; } }

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