php-doc-en/reference/misc/functions/define.xml

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  <refentry id="function.define">
   <refnamediv>
    <refname>define</refname>
    <refpurpose>Defines a named constant</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <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. See the 
     <link linkend="language.constants">section on constants</link>
     for more details.
    </para>
    <para>
     The name of the constant is given by <parameter>name</parameter>;
     the value is given by <parameter>value</parameter>.
    </para>
    <para>
     The optional third parameter
     <parameter>case_insensitive</parameter> is also available. If the
     value &true; is given, then the constant will be
     defined case-insensitive. The default behaviour is
     case-sensitive; i.e. CONSTANT and Constant represent different
     values.
    </para>
    <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>
    <para>
     &return.success;
    </para>
    <para>
     See also <function>defined</function>,
     <function>constant</function> and the section on <link
     linkend="language.constants">Constants</link>.
    </para>
   </refsect1>
  </refentry>

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