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Type safety and money

Mathias Verraes illustrates with practical examples how PHP’s type system can be used when designing a system.

Below is an attempt at illustrating a design/redesign process I went through at a client, who’s started refactoring the core systems their business depends on. Design is the part of software development that is the most messy, the hardest to fit into rules or well-defined processes. In fact, while writing this post, I tweeted:

“There are surprisingly few software design books that recommend taking a walk, a shower, or a nap, as an important step.”

None of the solutions offered below should be taken as truth. I may have already changed my mind on some of them by the time you read them.


Freek Van der Herten is a partner and developer at Spatie, an Antwerp based company that specializes in creating web apps with Laravel. After hours he writes about modern PHP and Laravel on this blog. When not coding he’s probably rehearsing with his kraut rock band. He loves waffles and butterflies.