What exactly is PHO OOP interface useful for?

Question

I really don't understand what an interface does. The interface doesn't give any functionality to its methods, and depends on the object to define the function.

If I have a class "myClass" and an object $object, I could just as easily add a new method to the object like $object->myMethod = function myFunc();

Why would I go through the trouble of first getting myClass to implement myInterface, and then define the method that way?

Could someone show me an example where an interface comes in handy?

Answer 1

in team work every body called a name for every function and property. so when another programmer want to use every class, so he/she confused...

interface can set a protocol for team to make clear functions and properties names...