Any examples of Google code Jam solution in php?

Question

Google

Hello, I decided to ask if someone participated in google code jam?
I decided to take part, I think to decide on php, but I don’t know in what form to decide.
https://code.google.com/codejam/contest/3264486/da...
The essence is clear, but how to write code, I look at last year's solutions, they generally connect some files there, can you explain?