php高级进阶之 curl异步请求

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wx61c95bc4475a3 2022-01-05 11:58:24 博主文章分类：php ©著作权

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/*
  * @purpose: 使用curl并行处理url
  * @return: array 每个url获取的数据
  * @param: $urls array url列表
  * @param: $callback string 需要进行内容处理的回调函数。无特殊需求可忽略此形参
  */
    public function curls($urls = array(), $callback = '')
    {
        $response = array();
        if (empty($urls)) {
            return $response;
        }
        $chs = curl_multi_init();
        $map = array();
        foreach($urls as $url){
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_TIMEOUT, 1);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($ch, CURLOPT_HEADER, 0);
            curl_setopt($ch, CURLOPT_NOSIGNAL, true);
            curl_multi_add_handle($chs, $ch);
            $map[strval($ch)] = $url;
        }
        do{
            if (($status = curl_multi_exec($chs, $active)) != CURLM_CALL_MULTI_PERFORM) {
                if ($status != CURLM_OK) { break; } //如果没有准备就绪，就再次调用curl_multi_exec
                while ($done = curl_multi_info_read($chs)) {
                    $info = curl_getinfo($done["handle"]);
                    $error = curl_error($done["handle"]);
                    $result = curl_multi_getcontent($done["handle"]);
                    $url = $map[strval($done["handle"])];
                    $rtn = compact('info', 'error', 'result', 'url');
                    $response[$url] = $rtn;
                    curl_multi_remove_handle($chs, $done['handle']);
                    curl_close($done['handle']);
                    //如果仍然有未处理完毕的句柄，那么就select
                    if ($active > 0) {
                        curl_multi_select($chs, 0.5); //此处会导致阻塞大概0.5秒。
                    }
                }
            }
        }
        while($active > 0); //还有句柄处理还在进行中
        curl_multi_close($chs);
        return $response;
    }