From 9543a3e64d6bf62337fe2056234bd249f9ed99fc Mon Sep 17 00:00:00 2001
From: Philip Olson <philip@php.net>
Date: Tue, 10 Jun 2003 04:30:35 +0000
Subject: [PATCH] Clarify what it means to use undefined constants.
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@130821 c90b9560-bf6c-de11-be94-00142212c4b1
---
language/constants.xml | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/language/constants.xml b/language/constants.xml
index dc7da1bbcb..f622ca90b3 100644
--- a/language/constants.xml
+++ b/language/constants.xml
@@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.32 $ -->
+<!-- $Revision: 1.33 $ -->
<chapter id="language.constants">
<title>Constants</title>
@@ -66,10 +66,14 @@
</note>
<simpara>
If you use an undefined constant, PHP assumes that you mean
- the name of the constant itself. A
- <link linkend="ref.errorfunc">notice</link> will be issued
- when this happens. Use the <function>defined</function>-function if
- you want to know if a constant is set.
+ the name of the constant itself, just as if you called it as
+ a <type>string</type> (CONSTANT vs "CONSTANT"). An error of level
+ <link linkend="ref.errorfunc">E_NOTICE</link> will be issued
+ when this happens. See also the manual entry on why
+ <link linkend="language.types.array.foo-bar">$foo[bar]</link> is
+ wrong (unless you first <function>define</function>
+ <literal>bar</literal> as a constant). If you simply want to check if a
+ constant is set, use the <function>defined</function> function.
</simpara>
<para>
These are the differences between constants and variables: