What is difference between abstract class and interface in PHP

1)-In abstract class this is not necessary that every method should be abstract but in interface every method is abstract.

2)-Single and multilevel inheritance is possible in abstract class but multiple and multilevel both type of inheritance is possible in interface.

3)-Abstract class you can define as well as declare methods but in interface you can only defined your method.

4)-Abstract class method could be public or protected both but interface method must be public only.