Index: language/constants.xml
===================================================================
RCS file: /repository/phpdoc/en/language/constants.xml,v
retrieving revision 1.25
diff -u -r1.25 constants.xml
--- language/constants.xml	29 May 2002 09:53:40 -0000	1.25
+++ language/constants.xml	11 Jun 2002 05:54:04 -0000
@@ -120,6 +120,37 @@
     </example>
 
    </para>
+   <warning>
+    <simpara>
+	 The following code will print <literal>OK</literal> if <literal>LOGGED_IN</literal> is <emphasis>undefined</emphasis>:
+	</simpara>
+    <programlisting role="php">
+<![CDATA[
+if(LOGGED_IN)
+{
+	echo 'OK';
+}
+else
+{
+	echo 'Denied';
+}
+]]>
+    </programlisting>
+	<simpara>You may work around this, by using the following:</simpara>
+	<programlisting role="php">
+<![CDATA[
+if(defined('LOGGED_IN') and LOGGED_IN)
+{
+	echo 'OK';
+}
+else
+{
+	echo 'Denied'
+}
+]]>
+	</programlisting>
+	<!-- Todo: How and when exactly was $foo[bar] introduced and explain the Won't fix. -->
+   </warning>
   </sect1>
   
   <sect1 id="language.constants.predefined">