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What is the Singleton pattern, and what are its intended use cases along with its commonly cited drawbacks? How does the Factory pattern help decouple object creation logic from the code that actually uses those objects? How does the Strategy pattern let you define a family of interchangeable algorithms and select one at runtime? How does the Observer pattern let objects react automatically to events occurring in another object, and where is this pattern commonly used in PHP applications? How can the SOLID principles guide the appropriate application of design patterns, and what risks arise from applying patterns without genuinely understanding the underlying problem they solve?
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How does the Repository pattern abstract data access logic away from an application's business logic, and what benefits does this separation provide?

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The Repository pattern introduces a dedicated layer responsible for retrieving and persisting data, exposing a clean, collection like interface to the rest of the application while hiding the actual details of how that data is stored, whether in a relational database, a NoSQL store, or even an external API, which lets business logic remain completely unaware of and unaffected by the specific underlying data storage technology, and makes it significantly easier to substitute a fake in memory repository during testing.
interface UserRepository {
    public function find(int $id): ?User;
    public function save(User $user): void;
}
class EloquentUserRepository implements UserRepository {
    public function find(int $id): ?User { return User::find($id); }
}
Real-world example A team testing their order processing logic substitutes a simple in memory fake repository implementing the same UserRepository interface, allowing their tests to run quickly without touching an actual database while still exercising the real business logic.

Common follow-ups: How does the Repository pattern relate to and differ from using an ORM directly?;What are the tradeoffs of adding a Repository layer on top of an ORM like Eloquent that already provides similar abstraction?

Eloquent ORM & Doctrine ORM;Unit Testing with PHPUnit
All 7 Design Patterns in PHP questions