think\Cookie::set PHP Method

    public static function set($name, $value = '', $option = null)
    {
        !isset(self::$init) && self::init();
        // 参数设置(会覆盖黙认设置)
        if (!is_null($option)) {
            if (is_numeric($option)) {
                $option = ['expire' => $option];
            } elseif (is_string($option)) {
                parse_str($option, $option);
            }
            $config = array_merge(self::$config, array_change_key_case($option));
        } else {
            $config = self::$config;
        }
        $name = $config['prefix'] . $name;
        // 设置cookie
        if (is_array($value)) {
            array_walk_recursive($value, 'self::jsonFormatProtect', 'encode');
            $value = 'think:' . json_encode($value);
        }
        $expire = !empty($config['expire']) ? $_SERVER['REQUEST_TIME'] + intval($config['expire']) : 0;
        if ($config['setcookie']) {
            setcookie($name, $value, $expire, $config['path'], $config['domain'], $config['secure'], $config['httponly']);
        }
        $_COOKIE[$name] = $value;
    }

 public function index()
 {
     $action = I("post.action");
     if ($action == "login") {
         $user = I("post.user");
         $pwd = I("post.pwd");
         if (strlen($user) < 3 || strlen($pwd) < 5) {
             $this->assign("alert", sweetAlert("温馨提示", "用户名或者密码格式不正确！", "warning"));
         } else {
             $pwd = md5Pwd($pwd);
             if ($user = $this->pdo->find("select uid from pre_users where (user=:user or email=:user) and pwd=:pwd limit 1", array(":user" => $user, ":pwd" => $pwd))) {
                 $sid = getSid();
                 $this->pdo->execute("update pre_users set sid=:sid where uid=:uid limit 1", array(":uid" => $user['uid'], ":sid" => $sid));
                 Cookie::set("userSid", $sid, array("path" => "/", "expire" => 3600 * 24));
                 $this->assign("alert", sweetAlert("登录成功！", "欢迎回来，进入控制面板！", "success", U("/index/Panel/index")));
                 return $this->fetch("common/sweetAlert");
             } else {
                 $this->assign("alert", sweetAlert("温馨提示", "用户名或者密码不正确！", "warning"));
             }
         }
     } elseif ($action == "reg") {
         $this->assign("isReg", true);
         $user = I("post.user");
         $pwd = I("post.pwd");
         $email = strtolower(I("post.email"));
         $code = I("post.code");
         if (strlen($user) < 3) {
             $this->assign("alert", sweetAlert("温馨提示", "用户名太短！", "warning"));
         } elseif (strlen($pwd) < 5) {
             $this->assign("alert", sweetAlert("温馨提示", "密码太简单！", "warning"));
         } elseif (strlen($code) != 4 || !isset($_COOKIE['verification']) || md5(strtolower($code)) !== $_COOKIE['verification']) {
             $this->assign("alert", sweetAlert("温馨提示", "验证码错误！", "warning"));
         } elseif (!preg_match('/^[a-zA-Z0-9\\-\\_]+@[a-zA-Z0-9\\-]+\\.[a-zA-Z]+$/', $email)) {
             $this->assign("alert", sweetAlert("温馨提示", "邮箱格式不正确！", "warning"));
         } elseif ($this->pdo->find("select uid from pre_users where user=:user limit 1", array(":user" => $user))) {
             $this->assign("alert", sweetAlert("温馨提示", "用户名已存在！", "warning"));
         } elseif ($this->pdo->find("select uid from pre_users where email=:email limit 1", array(":email" => $email))) {
             $this->assign("alert", sweetAlert("温馨提示", "邮箱账号已存在！", "warning"));
         } else {
             setCookie('verification', null, -1, '/');
             //销毁验证码
             $insert = array();
             $insert[':user'] = $user;
             $insert[':pwd'] = md5Pwd($pwd);
             $insert[':email'] = $email;
             $insert['sid'] = getSid();
             if ($this->pdo->execute("INSERT INTO `pre_users` (`user`, `email`, `pwd`, `sid`, `regtime`) VALUES (:user, :email, :pwd, :sid, NOW())", $insert)) {
                 $this->assign("alert", sweetAlert("注册成功！", "马上登录！", "success", U("index")));
                 return $this->fetch("common/sweetAlert");
             } else {
                 $this->assign("alert", sweetAlert("温馨提示", "注册失败，请稍候再试！", "warning"));
             }
         }
     }
     $this->assign("webTitle", C("webTitle") ? C("webTitle") : "网站首页");
     return $this->fetch();
 }