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try this:

class test
{
  function blah ($one, $two)
  {
    echo "ONE\n";
  }
  function blha ($one, $two, $three)
  {
    echo "TWO";
  }
}

In OOP, we can declare several prototypes of a class method, in php 4.0 i could do this, but with php 4.3.1 i cannot anymore.
I think this is a very important problem.
For a framework i use (and i contribute) this is a real big problem!

We fixed a bug so that it displays a warning when you try to do this.
It never actually worked in earlier releases (try it!), and we never stated that you could overload functions in this way in the manual.

the fact is here... ;o)
http://copix.aston.fr with php 4.1 and http://www.metal3d.com/copix php 4.3.1
this is the same code source...

I have had the same experience.  In PHP 4.2.2, I could have a function name with multiple declarations with different parameters.  However, I just migrated the site to a server that has PHP 4.3.5 and it crashed with that same fatal error??  What gives?  

In PHP 4.2.2 and earlier, I could use both functions prototypes successfully when they were in the same class...