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function_exists: * Works on both internal/user defined functions.

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* 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
This commit is contained in:
Philip Olson 2002-03-17 22:01:07 +00:00
parent f551986cb2
commit 4389459003
1 changed files with 11 additions and 7 deletions
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18
functions/funchand.xml
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@ -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>