Is there any debugger that will verify me obvious mistakes in code like a call to a function with invalid number of parameters? Or defined function that is not called anywhere... Stuff like that...is there any debugger capable of making my life easier? :\
There are some, just search for "How To Debug PHP Code And Useful PHP Debugging Tools" in google and the first result is your friend. I can't recommend one, because I haven't used any PHP debugger yet.