This little script does just what I want, not more not less.
The documentation and examples are there but just selecting better (more explaining) varaiable names would have saved me some time.
Function names like licz_pb are confusing. There are also some typos in the documentation and examples that confused me for a while.
I use it on my site as a very simple booking system.
Some improvements I would like to see:
1) Correct documentation
2) Select more explaining variable names
3) Change or make the separators configurable "," is better than ";" in most cases.