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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.2 $ -->
<!-- State: deprecated -->
<book xml:id="book.overload" xmlns="http://docbook.org/ns/docbook">
<title>Object property and method call overloading</title>
<titleabbrev>Object overloading</titleabbrev>
<preface xml:id="intro.overload">
&reftitle.intro;
<para>
The purpose of this extension is to allow overloading of object
property access and method calls. Only one function is defined
in this extension, <function>overload</function> which
takes the name of the class that should have this functionality
enabled. The class named has to define appropriate methods if
it wants to have this functionality: <literal>__get()</literal>,
<literal>__set()</literal> and <literal>__call()</literal>
respectively for getting/setting a property, or calling a method.
This way overloading can be selective. Inside these handler
functions the overloading is disabled so you can access object
properties normally.
</para>
&warn.experimental;
<warning>
<para>
This extension is not a part of PHP 5. PHP 5 supports <literal>__get()</literal>, <literal>__set()</literal> and
<literal>__call()</literal> natively. See the <link
linkend="language.oop5.overloading">Overloading in PHP 5</link> page
for more information.
</para>
</warning>
</preface>
&reference.overload.setup;
&reference.overload.constants;
&reference.overload.examples;
&reference.overload.reference;
</book>
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