return [ 'CONSTANT' => 'This is my first constant.' ]; And you can get this constant by including the facade Config : use Illuminate\Support\Facades\Config; Then get the value by constant name CONSTANT CONSTANT like below : echo Config::get('constants.CONSTANT'); And the result would be the value : This is my first constant. Read Constants online: https://riptutorial.com/laravel/topic/9192/constants