Behavior\TokenBuild::getToken PHP Method

    private function getToken()
    {
        $tokenName = $this->config['token_name'];
        $tokenType = $this->config['token_type'];
        if (!isset($_SESSION[$tokenName])) {
            $_SESSION[$tokenName] = [];
        }
        // 标识当前页面唯一性
        $tokenKey = md5($_SERVER['REQUEST_URI']);
        if (isset($_SESSION[$tokenName][$tokenKey])) {
            // 相同页面不重复生成session
            $tokenValue = $_SESSION[$tokenName][$tokenKey];
        } else {
            $tokenValue = is_callable($tokenType) ? $tokenType(microtime(true)) : md5(microtime(true));
            $_SESSION[$tokenName][$tokenKey] = $tokenValue;
            if (IS_AJAX && $this->config['token_reset']) {
                header($tokenName . ': ' . $tokenKey . '_' . $tokenValue);
            }
            //ajax需要获得这个header并替换页面中meta中的token值
        }
        return [$tokenName, $tokenKey, $tokenValue];
    }