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Manual: function_exists
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function_exists

(PHP3 >= 3.0.7, PHP4 )

function_exists --  Return true if the given function has been defined

Description

int function_exists (string function_name)

Checks the list of defined functions for function_name. Returns true if the given function name was found, false otherwise.


User Contributed Notes: function_exists

turadg@guru.nu
05-Aug-1999 08:49
The argument <I>function_name</I> must be in <B>lower</B> case.

turadg@guru.nu
19-Aug-1999 07:20
Correction to the note below:
The bug is <B>fixed in PHP >=3.09</B>. It exists in 3.07. I don't know about 3.08.

In any case, these two annotations can be purged.

zarkdav+php@eddy.easynet.INVALID
11-Sep-1999 10:59
Is it possible to find out whereas a class is defined (I've tried with function_exists but it doesn't work -- php 3.0.12).

--
Please replace INVALID with 'fr' (spam shield)

Anti Veeranna &lt;duke@no.spam.ee&gt;
14-Dec-1999 03:41
function_exists(some_class) works for me in php 3.0.12



jconde@solar.sar.net
16-Mar-2000 04:51
This funcion doesn't seem to be working in php4beta|p1



flash@drewnels.net
21-Apr-2000 01:35
try<pre>class_exists</pre>it worked for me

nicolasm@k-os.com
07-Jul-2000 03:10
To do an arror handler, I would need a way to get the function name: function func() { if ($error) { handleError(get_function_name(); } }
I currently use __LINE__ and __FILE__ but it's not enough for me!

g.tenchio@telco-tech.de
26-Jul-2000 01:45
function_exists() doesnt work with ImagePng, ImageGif, ImageJpeg because all functions are defined even if compiled only with gif support.

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