如何判断 function 是否在 php 中定义

Question

How do I determine if a function is defined in php? I'd 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 the function_exists function to determine if a function has been defined.

Answer 2

It's worth mentioning that you need to use method_exists to see if an object has a particular method defined.