enum.duplicateConstant

Code example

<?php declare(strict_types = 1); // lint >= 8.1

enum Suit
{
	const JOKER = 'joker';
	const JOKER = 'jester';
}

Why is it reported?

An enum (like a class) cannot declare two constants with the same name. PHP will produce a fatal error when it encounters a duplicate constant declaration. This applies to both regular class constants and enum case names sharing the same namespace within the enum.

How to fix it

Remove the duplicate constant declaration or rename one of the constants:

 enum Suit
 {
 	const JOKER = 'joker';
-	const JOKER = 'jester';
+	const JESTER = 'jester';
 }