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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<sect1 id="language.oop5.constants">
<title>Object Constants</title>
<para>
It is possible to define constant values on a per-class basis remaining the
same and unchangeable. Constants differ from normal variables in that you
don't use the <varname>$</varname> symbol to declare or use them. Like
<link linkend="language.oop5.static">static</link> members, constant values
can not be accessed from an instance of the object.
</para>
<example>
<title>Defining and using a constant</title>
<programlisting role="php">
<![CDATA[
<?php
class MyClass
{
const constant = 'constant value';
function showConstant() {
echo self::constant . "\n";
}
}
echo MyClass::constant . "\n";
$class = new MyClass();
$class->showConstant();
// echo $class::constant; is not allowed
?>
]]>
</programlisting>
</example>
</sect1>
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