PHP style

1. Strict types and strict comparison

• Every PHP file starts with declare(strict_types=1); (after the opening tag, before the namespace).
• Always compare with === / !==. Never == / !=.

2. Type hints and return types

• Every method declares parameter types and a return type, including void:

  function isAccessible(User $user, ?string $path = null): bool
  

• Use the short nullable notation ?Type instead of Type|null: