How to determine if a function is defined in php

Question

How to determine if a function is defined in php? I would like to do something like:

if(! function_defined(money_format)) // function not defined on windows
{
      function money_format($str) { ... }
}

Is this possible in php?

Answer 1

You can use a function function_existsto determine if a function has been defined.

Answer 2

It should be noted that you need to use method_exists to find out if a particular method is defined.