Undefined index:test in CodeIgniter -

in code igniter have declared constants in constatnts.php

define('test',$_request['test']); 

but not working , showing error notice: undefined index: testin c:\xampp\htdocs\userinterface\application\config\constants.php on line 39

what should do?

the error saying superglobal $_request not have item index of 'test'.

in other words, isset($_request['test'] === false

you need test is set before trying use define constant.

if(isset($_request['test'])) {   define('test',$_request['test']); } 

in case, because constant may not defined, need make sure exists before use it.

if(defined("test")) {   echo test; }