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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<sect1 xml:id="language.types.enumerations">
<title>Enumerations</title>
<?phpdoc print-version-for="enumerations"?>
<sect2 xml:id="language.types.enumerations.basics">
<title>Basic Enumerations</title>
<para>
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.
</para>
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
enum Suit
{
case Hearts;
case Diamonds;
case Clubs;
case Spades;
}
function do_stuff(Suit $s)
{
// ...
}
do_stuff(Suit::Spades);
?>
]]>
</programlisting>
</informalexample>
<simpara>
For a full discussion, see the
<link linkend="language.enumerations">Enumerations</link> chapter.
</simpara>
</sect2>
<sect2 xml:id="language.types.enumerations.casting">
<title>Casting</title>
<para>
If an <type>enum</type> is converted to an <type>object</type>, it is not
modified. If an <type>enum</type> is converted to an <type>array</type>,
an array with a single <literal>name</literal> key (for Pure enums) or
an array with both <literal>name</literal> and <literal>value</literal> keys
(for Backed enums) is created. All other cast types will result in an error.
</para>
</sect2>
</sect1>
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