Better Code Design in PHP

Are you tired of spending hours reading code just to find the right place to make a small change? Are you forced to split your application into several just so that devs don't step on each other's toes? This talk unites theory with practice to show you how to structure your code so that it is easy to read, to test and to maintain. You will step out with concrete ideas of how to improve your code design.

Transcript

1. Better Code Design in PHP PHP FWDAYS’24 @afilina@phpc.social
2. I Stand With Ukraine Anna Filina • Coding since 1997. • PHP, Java, C#, etc. • Legacy archaeology. • Test automation. • Talks and workshops. • YouTube videos. • Filina Consulting.
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5. I Stand With Ukraine Object Back-and-forth Collaborator
6. I Stand With Ukraine Object One-way reference Collaborator
7. I Stand With Ukraine Object Chatty Collaborator Step 1 Step 2 Step 3
8. I Stand With Ukraine Object Less chatty Collaborator Task Step 1 Step 2 Step 3
9. I Stand With Ukraine Is the complexity justified? Object 1 Object 2 Object 3 Object 4 Bus
10. I Stand With Ukraine Design Drive • Avoid complexity until I need it. • Do I understand what’s going on in terms of the business use case?
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12. I Stand With Ukraine Objects should speak business, not technical.
13. I Stand With Ukraine $lineItems = $this->orders->getLineItems($pendingOrderNumber); $taxTotals = $this->taxes->calculateForLineItems($lineItems);
14. I Stand With Ukraine Project • Marketplace for short-term rental: • Search properties for rent by city, date and number of guests. • Reserve & pay.
15. I Stand With Ukraine ReservationService ->reserve() PaymentManager ReservationManager processPayment(data) Templating saveReservation(data) confirmReservation(data) html EmailManager payment savePayment(data) confirmReservation(html)
16. I Stand With Ukraine ReservationService ->reserve() PaymentManager ReservationManager processPayment(data) Templating saveReservation(data) confirmReservation(data) html EmailManager payment savePayment(data) confirmReservation(html)
17. I Stand With Ukraine MakeReservation ReservationRepository add(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation notifyBuyer(paidReservation)
18. I Stand With Ukraine MakeReservation ReservationRepository add(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation notifyBuyer(paidReservation)
19. I Stand With Ukraine MakeReservation ReservationRepository add(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation notifyBuyer(paidReservation)
20. I Stand With Ukraine MakeReservation ReservationRepository add(paidReservation) notifyBuyer(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation
21. I Stand With Ukraine MakeReservation ReservationRepository add(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation notifyBuyer(paidReservation)
22. I Stand With Ukraine Good design needs no diagrams.
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25. I Stand With Ukraine Simple Code • No need for framework. • No need to design the database. • No need to have a UI. • Code the business rules.
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27. I Stand With Ukraine Handle HTTP Request Return HTTP Response 2 adults in Lviv on Jan 1 to Jan 7 Results containing “Lviv for 4”
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29. I Stand With Ukraine Handle HTTP Request Return HTTP Response 2 adults in Lviv on Jan 1 to Jan 7 Results containing “Lviv for 4”
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35. I Stand With Ukraine A complex system that works is invariably found to have evolved from a simple system that worked. — John Gall
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37. I Stand With Ukraine Too reusable becomes unusable.
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40. I Stand With Ukraine Input/output Business rules Infrastructure Use case
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52. I Stand With Ukraine PropertySearchHandler Lviv, Lviv Oblast, Ukraine Convert to coordinates. CitySearchHandler Lviv - Lviv, Lviv Oblast, Ukraine - Lviv Boulevard, Oshawa, ON
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54. I Stand With Ukraine PropertySearchHandler 49.8397, 24.0297 Longitude: -180 to +180 Latitude: -90 to +90 CitySearchHandler Lviv Lviv, Lviv Oblast, Ukraine 49.8397 24.0297
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56. I Stand With Ukraine Code is simply a model of the business rules and knowledge.
57. @afilina@phpc.social