How to define Global Variable or Constant in Laravel

We often need to define global variables/constants for our application, like Status, Conditions, Countries (we can put all countries in table as it will be along array/object), also weekdays, weekends and e.t.c. vary on projects. Status (Active, Inactive) and Conditions (Ok, Good, Better, Best) or Grade (F, C, D, A, A-, A+), so like these …