From 4389459003b611e4802c6ba51fb387c693fb40aa Mon Sep 17 00:00:00 2001
From: Philip Olson <philip@php.net>
Date: Sun, 17 Mar 2002 22:01:07 +0000
Subject: [PATCH] function_exists: * Works on both internal/user defined
 functions.                  * See also get_defined_functions. 		 *
 Implemented &return.success; 		 * Should we expand on when this
 "won't work", like with 		   certain image functions?

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@73823 c90b9560-bf6c-de11-be94-00142212c4b1
---
 functions/funchand.xml | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/functions/funchand.xml b/functions/funchand.xml
index 98b867d56a..201af968a6 100755
--- a/functions/funchand.xml
+++ b/functions/funchand.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.28 $ -->
+<!-- $Revision: 1.29 $ -->
  <reference id="ref.funchand">
   <title>Function Handling functions</title>
   <titleabbrev>Functions</titleabbrev>
@@ -427,9 +427,8 @@ foo (1, 2, 3);    // Prints 'Number of arguments: 3'
       <methodparam><type>string</type><parameter>function_name</parameter></methodparam>
      </methodsynopsis>
     <para>
-     Checks the list of defined functions for
-     <parameter>function_name</parameter>.    Returns &true; if the given
-     function name was found, &false; otherwise.
+     Checks the list of defined functions, both built-in (internal) and
+     user-defined, for <parameter>function_name</parameter>. &return.success;
      <informalexample>
       <programlisting role="php">
 <![CDATA[
@@ -441,11 +440,16 @@ if (function_exists('imap_open')) {
 ]]>
       </programlisting>
      </informalexample>
-     Note that a function name may exist, even if the function itself
-     is unusable due to configuration or compiling options. 
+     Note that a function name may exist even if the function itself
+     is unusable due to configuration or compiling options (with the 
+     <link linkend="ref.image">image</link> functions being an example).  
+     Also note that <function>function_exists</function> will return 
+     &false; for constructs, such as <function>include_once</function> 
+     and <function>echo</function>.
     </para>
     <para>
-     See also <function>method_exists</function>.
+     See also <function>method_exists</function> and 
+     <function>get_defined_functions</function>.
     </para>
    </refsect1>
   </refentry>