public function read()
    {
        $pwd = md5(123456);
        $code = rand(1000,9999);
        $c = ‘【下雨苏里】你的验证码是:‘.$code.‘，3分钟内有效！‘;
        $url ="http://api.smsbao.com/sms?u=3240491372&p=$pwd&m=15294642681&c=$c";
        $ch = curl_init();
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
        $res = curl_exec($ch);
        var_dump($res);
    }