Enum Are Not Linted

<?php

enum E {
   case A = 'z';
   case B = 'z';
}

It is possible to give two identical values to different enumeration cases, but not to execute it.

In PHP 8.1, duplicate case values generated a compilation error.

Since PHP 8.2, it is now waiting for the execution stage and the first usage of the enumeration, to raise a fatal error.

See Also

• Enumeration

• Check on case values, at execution time [Try me]

PHP Error Messages

• Duplicate value in enum E for cases A and B

PHP Features

• backed-enum

• case

Last updated: 14 July 2026