Non-enum class %s cannot implement interface %s
Description
UnitEnum is an PHP native and reserved interface. It is only used with enumerations. It is also handled by PHP itself, which adds it to enumerations: there is no need to add it explictly. This applies to BackedEnum and UnitEnum, as of PHP 8.4.
Example
<?php
class X implements YnitEnum {}
?>
Literal Examples
- Non-enum class x cannot implement interface UnitEnum
- Non-enum class x cannot implement interface BackEnum
Alternatives
- Turn the class into an enumeration.
- Remove the UnitEnum implementation.