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Better Code Design in PHP BETTERCODE() 2023 | ONLINE @
[email protected]
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Anna Filina • Coding since 1997. • PHP, Java, C#, etc. • Legacy archaeology. • Test automation. • Talks and workshops. • YouTube videos. • Filina Consulting.
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Object Mutual reference Collaborator
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Object One-way reference Collaborator
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Object Chatty Collaborator Step 1 Step 2 Step 3
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Object Less chatty Collaborator Task Step 1 Step 2 Step 3
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Is the complexity justified? Object 1 Object 2 Object 3 Object 4 Bus
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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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Objects should speak business, not technical.
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$lineItems = $this->orders->getLineItems($pendingOrderNumber); $taxTotals = $this->taxes->calculateForLineItems($lineItems);
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Project • Marketplace for short-term rental: • Search properties for rent by city, date and number of guests. • Reserve & pay.
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ReservationService ::reserve() PaymentManager ReservationManager processPayment(data) Templating saveReservation(data) confirmReservation(data) html EmailManager payment savePayment(data) confirmReservation(html)
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ReservationService ::reserve() PaymentManager ReservationManager processPayment(data) Templating saveReservation(data) confirmReservation(data) html EmailManager payment savePayment(data) confirmReservation(html)
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MakeReservation ReservationRepository add(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation notifyBuyer(paidReservation)
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MakeReservation ReservationRepository add(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation notifyBuyer(paidReservation)
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MakeReservation ReservationRepository add(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation notifyBuyer(paidReservation)
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MakeReservation ReservationRepository add(paidReservation) notifyBuyer(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation
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MakeReservation ReservationRepository add(paidReservation) ReservationNotifier PaymentProcessor capture(charge) paymentConfirmation notifyBuyer(paidReservation)
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Good design needs no diagrams.
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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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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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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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A complex system that works is invariably found to have evolved from a simple system that worked. — John Gall
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Too reusable becomes unusable.
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Input/output Business rules Infrastructure Use case
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PropertySearchHandler Lviv, Lviv Oblast, Ukraine Validate anyway. Convert to coordinates. CitySearchHandler Lviv Lviv, Lviv Oblast, Ukraine Lviv Boulevard, Oshawa, ON
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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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Code is simply a model of the business rules and knowledge.
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@
[email protected]