Enumerations
Basic Enumerations
Enumerations are a restricting layer on top of classes and class constants, intended to provide a way to define a closed set of possible values for a type.
<?php enum Suit { case Hearts; case Diamonds; case Clubs; case Spades; } function do_stuff(Suit $s) { // ... } do_stuff(Suit::Spades); ?>
For a full discussion, see the Enumerations chapter.
Casting
If an enum is converted to an object, it is not modified. If an enum is converted to an array, an array with a single name
key (for Pure enums) or an array with both name
and value
keys (for Backed enums) is created. All other cast types will result in an error.
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https://www.php.net/manual/en/language.types.enumerations.php