PHP Laravel

PHP & Laravel Development

Code Style

• declare(strict_types=1) in every file
• Happy path last — handle errors/guards first, success at the end. Use early returns; avoid else.
• Comments only explain why, never what. Never comment tests. If code needs a "what" comment, rename or restructure instead.
• No single-letter variables — $exception not $e, $request not $r
• ?string not string|null. Always specify void. Import classnames everywhere, never inline FQN.
• Validation uses array notation ['required', 'email'] for easier custom rule classes

Modern PHP (8.2+)

Use these when applicable — do not explain them in comments (Claude and developers know them):

• Readonly classes and properties for immutable data
• Enums with methods and interfaces for domain constants
• Match expressions over switch
• Constructor promotion with readonly
• First-class callable syntax $fn = $obj->method(...)
• Fibers for cooperative async when Swoole/ReactPHP not available
• DNF types (Stringable&Countable)|null for complex constraints

Laravel Architecture

• Fat models, thin controllers — controllers only: validate, call service/action, return response
• Service classes for business logic with readonly DI: __construct(private readonly PaymentService $payments)
• Action classes (single-purpose invokable) for operations that cross service boundaries
• Form Requests for all validation — never validate inline in controllers
• Events + Listeners for side effects (notifications, logging, cache invalidation). Do not put side effects in services.
• Feature folder organization over type-based when project exceeds ~20 models

Eloquent

• Model::preventLazyLoading(!app()->isProduction()) — catch N+1 during development
• Select only needed columns: Post::with(['user:id,name'])->select(['id', 'title', 'user_id'])
• Bulk operations at database level: Post::where('status', 'draft')->update([...]) — do not load into memory to update
• increment()/decrement() for counters in a single query
• Composite indexes for common query combinations
• Chunking for large datasets (chunk(1000)), lazy collections for memory-constrained processing
• $guarded = [] is a mass assignment vulnerability — always use explicit $fillable

API Resources

• whenLoaded() for relationships — prevents N+1 in responses
• when() / mergeWhen() for permission-based field inclusion
• whenPivotLoaded() for pivot data
• withResponse() for custom headers, with() for metadata (version, pagination)

Queues & Jobs

• Job batching with Bus::batch([...])->then()->catch()->finally()->dispatch()
• Job chaining for sequential ops: Bus::chain([new Step1, new Step2])->dispatch()
• Rate limiting: Redis::throttle('api')->allow(10)->every(60)->then(fn() => ...)
• ShouldBeUnique interface to prevent duplicate processing
• Always handle failures — implement failed() method on jobs

Testing (Pest)

• RED → verify RED → GREEN → verify GREEN → REFACTOR
• test() / it() syntax with RefreshDatabase trait
• One assertion focus per test. Test name describes the behavior, not the method.
• Sanctum::actingAs($user, ['ability']) for API auth testing
• Run relevant tests first, offer full suite after

Discipline

• For non-trivial changes, pause and ask: "is there a more elegant way?" Skip for obvious fixes.
• Simplicity first — every change as simple as possible, impact minimal code
• Only touch what's necessary — avoid introducing unrelated changes
• No hacky workarounds — if a fix feels wrong, step back and implement the clean solution

Anti-Patterns

• Querying in loops — use eager loading or whereIn() instead
• Empty catch blocks — log or rethrow, never swallow
• Business logic in controllers — extract to service/action instead
• protected $guarded = [] — use $fillable instead
• Inline validation in controllers — use Form Requests instead