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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.class-alias" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>class_alias</refname>
<refpurpose>Creates an alias for a class</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>class_alias</methodname>
<methodparam><type>string</type><parameter>class</parameter></methodparam>
<methodparam><type>string</type><parameter>alias</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>autoload</parameter><initializer>&true;</initializer></methodparam>
</methodsynopsis>
<para>
Creates an alias named <parameter>alias</parameter>
based on the user defined class <parameter>class</parameter>.
The aliased class is exactly the same as the original class.
</para>
<note>
<simpara>
As of PHP 8.3.0, <function>class_alias</function> also supports
creating an alias of a PHP internal class.
</simpara>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>class</parameter></term>
<listitem>
<para>
The original class.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>alias</parameter></term>
<listitem>
<para>
The alias name for the class.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>autoload</parameter></term>
<listitem>
<para>
Whether to <link linkend="language.oop5.autoload">autoload</link>
if the original class is not found.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.3.0</entry>
<entry>
<function>class_alias</function> now supports creating an alias of an internal class.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>class_alias</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
class Foo { }
class_alias('Foo', 'Bar');
$a = new Foo;
$b = new Bar;
// the objects are the same
var_dump($a == $b, $a === $b);
var_dump($a instanceof $b);
// the classes are the same
var_dump($a instanceof Foo);
var_dump($a instanceof Bar);
var_dump($b instanceof Foo);
var_dump($b instanceof Bar);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
bool(true)
bool(false)
bool(true)
bool(true)
bool(true)
bool(true)
bool(true)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
Class names are case-insensitive in PHP, and this is reflected in this
function. Aliases created by <function>class_alias</function> are declared
in lowercase. This means that for a class
<literal>MyClass</literal>, the <code>class_alias('MyClass', 'MyClassAlias')</code>
call will declare a new class alias named <literal>myclassalias</literal>.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>get_parent_class</function></member>
<member><function>is_subclass_of</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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