Help with PHP classes

[thinkweb]

Can anyone suggest what may be the cause of the error:

"Fatal error: Call to a member function on a non-object in..."?

The problem is that the code works flawlessly on my test server, but produces the above error on the live server (which runs the same version of PHP - 4.3.9).

The code calls a member funtion from within the object itself i.e. $this->myFunction()

So my question is really "Is anyone aware of certain PHP configuration settings that may affect how classes perform?"

Any suggestions would be much appreciated.

[thinkweb]

Nevermind, I have it sorted now.

The cause was that globals were registered on the live server, causing a conflict between a session variable and a object name....