判断是否ajax请求

[php]代码库

        /**
         * Is ajax Request?
         *
         * Test to see if a request contains the HTTP_X_REQUESTED_WITH header
         *
         * @return         boolean
         */
        public function is_ajax_request()
        {
                return ($this->server('HTTP_X_REQUESTED_WITH') === 'XMLHttpRequest');
        }