Is there a function to c if a php function exists

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I have been implementing a system on a different ISP than I normally use
and have got:-

Fatal error: Call to undefined function: cal_days_in_month()
in /home/hosted/www.menublackboard.com/public_html/dev/classes/validator.class.php on line 134

I found a reference to this an the web and it seems PHP is not compiled
with calender support.

"recompile php with the "--enable-calendar" option."

Cant see being able to get the to re-compile PHP so I guess I am going
to have to disable the feature.  I seem to remember a while ago seeing a
function to test weather a function exists in PHP.  That way I can have
the relevant validation skipped if the function is missing (I will tell
the client if they get decent hosting it will start working).

So something like 

  function_exists(  cal_days_in_month() )

Anyone know what the function is called.

Ben
-- 
Ben Edwards - Poole, UK, England
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