abstract class and interface php

What is the difference between interface and abstract class?
When one or more classes use the same interface, it is referred to as "polymorphism". Interface are similar to abstract classes. The difference between interfaces and abstract classes are: All interface methods must be public, while abstract class methods is public or protected
Can a PHP class implement multiple interfaces?
Any class that implements the interface commits to implementing all the methods it defines or it must be declared abstract. Interfaces can help to manage the fact that, like Java, PHP does not support multiple inheritance. A PHP class can only extend a single parent. However, you can make a class promise to implement as many interfaces as you want.
Does PHP have abstract classes and methods?
PHP has abstract classes and methods. Classes defined as abstract cannot be instantiated, and any class that contains at least one abstract method must also be abstract. Methods defined as abstract simply declare the method's signature; they cannot define the implementation.
What is an object interface in PHP?
So, an Object Interface is really a built-in part of an Abstract Class. One fairly important difference between php's abstract functions and, say, Java, is that php does not specify the return type in any way - or indeed whether there has to be one.

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