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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<sect1 xml:id="language.types.iterable">
<title>Iterables</title>
<para>
<type>Iterable</type> is a built-in compile time type alias for
<!-- Need to improve rendering of free-standing type elements in PhD
<type class="union"><type>array</type><type>Traversable</type></type>.
-->
<literal>array|Traversable</literal>.
From its introduction in PHP 7.1.0 and prior to PHP 8.2.0,
<type>iterable</type> was a built-in pseudo-type that acted as the
aforementioned type alias and can be used as a type declaration.
An iterable type can be used in &foreach; and with
<command>yield from</command> within a
<link linkend="language.generators">generator</link>.
</para>
<note>
<para>
Functions declaring iterable as a return type may also be <link
linkend="language.generators">generators</link>.
<example>
<title>
Iterable generator return type example
</title>
<programlisting role="php">
<![CDATA[
<?php
function gen(): iterable {
yield 1;
yield 2;
yield 3;
}
?>
]]>
</programlisting>
</example>
</para>
</note>
</sect1>
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