enum in PHP
``` <?php enum Suit { case Hearts; case Diamonds; case Clubs; case Spades; } function do_stuff(Suit $s) { } do_stuff(Suit::Spades); ```
``` <?php enum Suit { case Hearts; case Diamonds; case Clubs; case Spades; } function do_stuff(Suit $s) { } do_stuff(Suit::Spades); ```