// 定义当前请求的系统常量
define('NOW_TIME', $_SERVER['REQUEST_TIME']);
define('REQUEST_METHOD',$_SERVER['REQUEST_METHOD']);
define('IS_GET', REQUEST_METHOD =='GET' ? true : false);
define('IS_POST', REQUEST_METHOD =='POST' ? true : false);
define('IS_PUT', REQUEST_METHOD =='PUT' ? true : false);
define('IS_DELETE', REQUEST_METHOD =='DELETE' ? true : false);