public function http_curl(){
        //1.初始化
        $ch = curl_init();
        $url = 'http://www.baidu.com';
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
        $outdata =curl_exec($ch) ;
        curl_close($ch);
        var_dump($outdata);
    }