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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<reference xml:id="class.traversable" role="class" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
<title>The <interfacename>Traversable</interfacename> interface</title>
<titleabbrev>Traversable</titleabbrev>
<partintro>
<!-- {{{ Traversable intro -->
<section xml:id="traversable.intro">
&reftitle.intro;
<para>
Interface to detect if a class is traversable using &foreach;.
</para>
<para>
Abstract base interface that cannot be implemented alone. Instead, it must
be implemented by either <interfacename>IteratorAggregate</interfacename> or
<interfacename>Iterator</interfacename>.
</para>
</section>
<!-- }}} -->
<section xml:id="traversable.synopsis">
&reftitle.interfacesynopsis;
<!-- {{{ Synopsis -->
<classsynopsis class="interface">
<oointerface>
<interfacename>Traversable</interfacename>
</oointerface>
</classsynopsis>
<!-- }}} -->
<para>
This interface has no methods, its only purpose is to be the base
interface for all traversable classes.
</para>
</section>
<section role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>7.4.0</entry>
<entry>
The <interfacename>Traversable</interfacename> interface can now be implemented
by abstract classes. Extending classes must implement
<interfacename>Iterator</interfacename> or
<interfacename>IteratorAggregate</interfacename>.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</section>
<section role="notes">
&reftitle.notes;
<note>
<para>
Internal (built-in) classes that implement this interface can be used in
a &foreach; construct and do not need to implement
<interfacename>IteratorAggregate</interfacename> or
<interfacename>Iterator</interfacename>.
</para>
</note>
<note>
<para>
Prior to PHP 7.4.0, this internal engine interface couldn't be implemented
in PHP scripts. Either <interfacename>IteratorAggregate</interfacename>
or <interfacename>Iterator</interfacename> must be used instead.
</para>
</note>
</section>
</partintro>
</reference>
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