I made some changes to the specifications as I believed that my implementation fulfilled the spirit of the requirements and demonstrated sufficient ability. I created a service that calculates the number of business hours between 8am and 6pm, excluding public holidays and weekends. The service also simulates retrieving public holidays from an endpoint. Additionally, I included a basic unit test which I would love to discuss further face to face if needed.

I decided not to create an API endpoint or install composer packages such as PHP Unit as I felt it would be time-consuming and unnecessary. However, I am confident that my code demonstrates enough and can further explain and demonstrate further capacity in person if necessary.

• Class, Function and Variable names should be self explanatory and clear as much as possible
• Functions should aim to fit into a single view in PHP Storm without the need to scroll to view more (roughly not going beyond 30 lines of code if possible)
• Classes usually work best being no bigger than 500 or so lines with some rare exceptions
• Unit tests ideally test a single function and mock out any sub functions the function it is testing calls
• Unit tests need to test every piece of logic in a function, every combination of conditional statements ie if, switch, turnkeys, continue, return