How can the use of interfaces in PHP improve code organization and maintainability, especially in the context of repositories and data access?

Using interfaces in PHP can improve code organization and maintainability by providing a clear contract for classes to adhere to. In the context of repositories and data access, interfaces can define common methods that need to be implemented by different data access classes. This allows for easier swapping of implementations without affecting the code that uses these repositories. 

interface UserRepositoryInterface {
    public function findById($id);
    public function save(User $user);
}

class DbUserRepository implements UserRepositoryInterface {
    public function findById($id) {
        // Database query to find user by id
    }

    public function save(User $user) {
        // Database query to save user
    }
}

class FileUserRepository implements UserRepositoryInterface {
    public function findById($id) {
        // File system logic to find user by id
    }

    public function save(User $user) {
        // File system logic to save user
    }
}

Keywords

Interfaces PHP code organization maintainability repositories

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