php undef function
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Solved by dragosudeki,
I don't know PHP, but aren't you supposed to do it like this?
object->function()
Its a function of an object, like getNaam(). The error is occuring because it assumes you made a printGegevens() function, but you haven't. The printGegevens() is supplied under an object, but you are not using the correct syntax to use that function.

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