Apply SRP by keeping each class focused, and apply dependency inversion by depending on interfaces: ~~~php interface UserRepository { public function findById(int $id): ?User; } final class UserService { public function __construct( private UserRepository $repository, ) { } } ~~~ Use composition and constructor injection for testability; extract unrelated responsibilities instead of growing a large class.
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Apply SRP by keeping each class focused, and apply dependency inversion by depending on interfaces:
~~~php
interface UserRepository
{
public function findById(int $id): ?User;
}
final class UserService
{
public function __construct(
private UserRepository $repository,
) {
}
}
~~~
Use composition and constructor injection for testability; extract unrelated responsibilities instead of growing a large class.
