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Traits

Enumerations may leverage traits, which will behave the same as on classes. The caveat is that traits used in an enum must not contain properties. They may only include methods and static methods. A trait with properties will result in a fatal error.

<?php
interface Colorful
{
public function
color(): string;
}

trait
Rectangle
{
public function
shape(): string {
return
"Rectangle";
}
}

enum Suit implements Colorful
{
use
Rectangle;

case
Hearts;
case
Diamonds;
case
Clubs;
case
Spades;

public function
color(): string
{
return
match($this) {
Suit::Hearts, Suit::Diamonds => 'Red',
Suit::Clubs, Suit::Spades => 'Black',
};
}
}
?>
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