Working on a project involving dealerships and cars, I needed a way to validate car VIN (Vehicle Identification Number) so I came up with a custom Laravel validation rule.
Composer was just something I used to get my project up and running and occasionally install additional libraries. I never put too much thought into it – it just worked. Sometimes I would run into problems, but often they were easily fixed by running
composer install or
composer dump-autoload. I had no idea what dump-autoload was doing, but it was fixing things.