Value listing
Both Pure Enums and Backed Enums implement an internal interface named UnitEnum. UnitEnum includes a static method cases(). cases() returns a packed array of all defined Cases in the order of declaration.
<?php Suit::cases(); // Produces: [Suit::Hearts, Suit::Diamonds, Suit::Clubs, Suit::Spades] ?>
Manually defining a cases() method on an Enum will result in a fatal error.
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https://www.php.net/manual/en/language.enumerations.listing.php
