This is my submission for the FlatFair coding challenge. I've taken a vanilla PHP approach to display that I understand certain concepts beyond their implementation within any specific frameworks or libraries. The only library used is PHPUnit to write and run tests.
The core of this app is the ./src/Caculator class which contains
the calculate_membership_fee function.
I have written tests for this method in ./tests/CalculateMembershipFeeTest.php and it's results.
To execute the tests, from the root directory run:
composer install./vendor/phpunit/phpunit/phpunit ./tests/CalculateMembershipFeeTest.php