Const keyword

• Constants are one type of variable which we can define for any class with keyword const.
• Value of these variables cannot be changed any how after assigning.
• Class constants are different than normal variables, as we do not need $ to declare the class constants.
• If we are inside the class then values of the constants can be get using self keyword, but accessing the value outside the class you have to use Scope Resolution Operator.

Example 1

Output:

Example 2

Output: