PHP implementation for IntIntMap
# Run example script
λ cd /path/to/project/docker
λ docker-compose run php composer dump-autoload
λ docker-compose run php php example.php -k KEY -v VALUE
# Run tests
λ cd /path/to/project/docker
λ docker-compose run php composer install
λ docker-compose run php php vendor/phpunit/phpunit/phpunit tests