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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.11 $ -->
<refentry xml:id="function.define" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>define</refname>
<refpurpose>Defines a named constant</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>define</methodname>
<methodparam><type>string</type><parameter>name</parameter></methodparam>
<methodparam><type>mixed</type><parameter>value</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>case_insensitive</parameter></methodparam>
</methodsynopsis>
<para>
Defines a named constant at runtime.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>name</parameter></term>
<listitem>
<para>
The name of the constant.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>value</parameter></term>
<listitem>
<para>
The value of the constant; only scalar and <type>null</type> values are allowed.
Scalar values are <type>integer</type>,
<type>float</type>, <type>string</type> or <type>boolean</type> values.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>case_insensitive</parameter></term>
<listitem>
<para>
If set to &true;, the constant will be defined case-insensitive.
The default behaviour is case-sensitive; i.e.
<literal>CONSTANT</literal> and <literal>Constant</literal> represent
different values.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Defining Constants</title>
<programlisting role="php">
<![CDATA[
<?php
define("CONSTANT", "Hello world.");
echo CONSTANT; // outputs "Hello world."
echo Constant; // outputs "Constant" and issues a notice.
define("GREETING", "Hello you.", true);
echo GREETING; // outputs "Hello you."
echo Greeting; // outputs "Hello you."
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>defined</function></member>
<member><function>constant</function></member>
<member>The section on <link linkend="language.constants">Constants</link></member>
</simplelist>
</para>
</refsect1>
</refentry>
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