Enumeration constants

    Enumerations may include constants, which may be public, private, or protected, although in practice private and protected are equivalent as inheritance is not allowed.

    An enum constant may refer to an enum case:

    <?php

    enum Size
    {
    case     Small;
    case     Medium;
    case     Large;

    public const     Huge = self::Large;
    }
    ?>

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    User Contributed Notes 1 note

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    9
    Hayley Watson
    11 months ago
    Just to clarify, enum constants *can* contain cases, but they don't *have* to; other constant values are legitimate - including cases of other Enumerations.

    <?php
    enum Suit
    {
    case     Hearts;
    case     Clubs;
    case     Spades;
    case     Diamonds;

    public const     Card = Size::Large; // A case from a different enum
    }

    enum     Size
    {
    case     Small;
    case     Medium;
    case     Large;

    public const     Scale = 297/210; // A float
    }

    echo     Suit::Diamonds::Card::Scale; // Getting the constant Scale from the constant Card in a Suit.
    ?>
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