PHP Abstract Classes Use Cases

Scenarios where PHP abstract classes are used:

1. Defining an abstract class as an interface: An abstract class can define a set of methods as an interface, which subclasses must implement. This ensures that subclasses have the same behavior, while also achieving polymorphism.
2. Providing public methods and attributes: Abstract classes can include some public methods and attributes that can be inherited and used by subclasses, ultimately improving code reusability and maintainability.
3. Encapsulating common behavior: Abstract classes can define common behaviors that subclasses can inherit and implement. This ensures that subclasses have the same behaviors while reducing code repetition.
4. Providing extension points: Abstract classes can define certain methods as extension points for subclasses, where subclasses can implement their own logic by overriding these methods. This can offer a higher level of flexibility and extensibility.

In conclusion, abstract classes are used when defining a set of common behaviors that need to be inherited and implemented by subclasses. Abstract classes help in standardizing and encapsulating code, making it clearer and more maintainable.