PHP 发送request请求

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    /**     * 发送request请求     * @param $url     * @param bool $ssl     * @param string $type     * @param null $data     * @return bool|mixed     */    public function is_request($url, $ssl = true, $type = 'GET', $data = null)    {        $curl = curl_init();        curl_setopt($curl, CURLOPT_URL, $url);        $user_agent = isset($_SERVER['HTTP_USERAGENT']) ? $_SERVER['HTTP_USERAGENT'] : 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36';        curl_setopt($curl, CURLOPT_USERAGENT, $user_agent);//请求代理信息        curl_setopt($curl, CURLOPT_AUTOREFERER, true);//referer头 请求来源        curl_setopt($curl, CURLOPT_TIMEOUT, 30);//请求超时        curl_setopt($curl, CURLOPT_HEADER, false);//是否处理响应头        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);//curl_exec()是否返回响应        if ($ssl) {            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);//禁用后curl将终止从服务端进行验证            curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);//检查服务器ssl证书中是否存在一个公用名（common name）        }        if ($type == "POST") {            curl_setopt($curl, CURLOPT_POST, true);            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);        }        //发出请求        $response = curl_exec($curl);        if ($response === false) {            return false;        }        return $response;    }
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