Enumerations

    (PHP 8 >= 8.1.0)

    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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