PHP多线程 curl_multi_init 的使用

php中可以通过CURL处理HTTP请求，其中curl_init()是单线程模式，如果需要对事务处理走多线程模式，那么就需要用到curl_multi_init()函数。

本案例用来测试大并发的情况下 curl_multi_init() 到底比 curl_init() 快多少。

话不多少，直接上代码：

<?php
class Http
{
    /**
     * https 发起post请求
     * @param string $url url信息
     * @param mixed $data 参数信息[$data = '{"a":1,"b":2}' or $data = array("a" => 1,"b" => 2)]
     * @param int $timeOut 超时设置
     * @param string $proxyHost 代理host
     * @param int $proxyPort 代理端口
     * @return string
     */
    public static function post($url, $data = null, $timeOut = 20, $proxyHost = null, $proxyPort = null)
    {
        try {
            if (strlen($url) < 1) {
                return null;
            }

            $ch = curl_init();
            // 设置url
            curl_setopt($ch, CURLOPT_URL, $url);
            if (false == empty($data)) {
                curl_setopt($ch, CURLOPT_POST, 1);
                if (is_array($data) && count($data) > 0) {
                    curl_setopt($ch, CURLOPT_POST, count($data));
                }
                curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
            }
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

            // 如果成功只将结果返回，不自动输出返回的内容
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            // user-agent
            curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0");
            // 超时
            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeOut);

            // 使用代理
            if (strlen($proxyHost) > 0 && strlen($proxyPort) > 0) {
                // 代理认证模式
                curl_setopt($ch, CURLOPT_PROXYAUTH, CURLAUTH_BASIC);
                // 代理服务器地址
                curl_setopt($ch, CURLOPT_PROXY, $proxyHost);
                // 代理服务器端口
                curl_setopt($ch, CURLOPT_PROXYPORT, $proxyPort);
                // 使用http代理模式
                curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
            }

            // 执行
            $out = curl_exec($ch);
            // 关闭
            curl_close($ch);
            return $out;
        } catch (Exception $e) {
            return null;
        }

    }

    /**
     * https 发起post多发请求
     * @param array $nodes url和参数信息。
     * $nodes = [
     * [0] = > [
     * 'url' => 'http://www.baidu.com',
     * 'data' => '{"a":1,"b":2}'
     * ],
     * [1] = > [
     * 'url' => 'http://www.baidu.com',
     * 'data' => null
     * ]
     * ....
     * ];
     * @param int $timeOut 超时设置
     * @return array
     */
    public static function postMulti($nodes, $timeOut = 5)
    {
        try {
            if (false == is_array($nodes)) {
                return array();
            }

            $mh = curl_multi_init();
            $curlArray = array();
            foreach ($nodes as $key => $info) {
                if (false == is_array($info)) {
                    continue;
                }
                if (false == isset($info['url'])) {
                    continue;
                }

                $ch = curl_init();
                // 设置url
                $url = $info['url'];
                curl_setopt($ch, CURLOPT_URL, $url);

                $data = isset($info['data']) ? $info['data'] : null;
                if (false == empty($data)) {
                    curl_setopt($ch, CURLOPT_POST, 1);
                    // array
                    if (is_array($data) && count($data) > 0) {
                        curl_setopt($ch, CURLOPT_POST, count($data));
                    }
                    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
                }

                curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
                curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
                // 如果成功只将结果返回，不自动输出返回的内容
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
                // user-agent
                curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0");
                // 超时
                curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeOut);

                $curlArray[$key] = $ch;
                curl_multi_add_handle($mh, $curlArray[$key]);
            }

            $running = NULL;
            do {
                usleep(10000);
                curl_multi_exec($mh, $running);
            } while ($running > 0);

            $res = array();
            foreach ($nodes as $key => $info) {
                $res[$key] = curl_multi_getcontent($curlArray[$key]);
            }
            foreach ($nodes as $key => $info) {
                curl_multi_remove_handle($mh, $curlArray[$key]);
            }
            curl_multi_close($mh);
            return $res;
        } catch (Exception $e) {
            return array();
        }

    }

}

$count = 10;

//2.1 循环调用Http::post() 100次
$url = 'https://api.weixin.qq.com/cgi-bin/getcallbackip?access_token=abcdasdfasdfasdfasdfasdfasdfasdfasdfasdf';
$startTime = microtime(true);
for ($i = 1; $i <= $count; $i++) {
    $res = Http::post($url);
}
$endTime = microtime(true);

echo $endTime - $startTime;
echo "\n";

//2.2 调用Http::postMulti()一次发100个url
$url = 'https://api.weixin.qq.com/cgi-bin/getcallbackip?access_token=abcdasdfasdfasdfasdfasdfasdfasdfasdfasdf';
$nodes = array();
for ($i = 1; $i <= $count; $i++) {
    $info = array();
    $info['url'] = $url;
    $nodes[] = $info;
}

$startTime = microtime(true);
$res = Http::postMulti($nodes);
$endTime = microtime(true);

echo $endTime - $startTime;
echo "\n";

?>

运行结果：

* 当$count=10的情况下，耗时分别为：

3.4119510650635
0.44486904144287

curl_multi_init() 比 curl_init() 快了8倍。

* 当 $count=100的情况下，耗时分别为：

34.190015077591
1.9350771903992

curl_multi_init() 比 curl_init() 快了17倍。