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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Hayley Watson
1 year 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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