[Solved] What is true about constants declared inside a PHP interface? — Ans: They are public by default and cannot be changed. | PHP

PHP - Interfaces and Traits

What is true about constants declared inside a PHP interface?

AThey are public by default and cannot be changed.

BThey can be private or protected.

CThey can be changed by implementing classes.

DThey must be declared with the keyword 'var'.

Step-by-Step Solution

Solution:

Step 1: Understand interface constant visibility
Constants in interfaces are always public and cannot have other visibility modifiers.
Step 2: Understand mutability of interface constants
Constants cannot be changed by implementing classes; they are fixed values.
Final Answer:
They are public by default and cannot be changed. -> Option A
Quick Check:
Interface constants = public and immutable [OK]

Quick Trick: Interface constants are always public and unchangeable [OK]

Common Mistakes:

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What is true about constants declared inside a PHP interface?