Object-oriented programming allows procedures about objects to be created whose exact type is not known until runtime. For example, a screen cursor may change its shape from an arrow to a line ...

Object-Oriented PHP by Peter Lavin teaches the fundamentals of object-oriented programming (OOP) by guiding the reader through a series of inter-related example classes. There are two audiences ...

What is polymorphism in object oriented programming ? The word polymorphism comes from Greek and means having several different forms. This is one of the essential concepts of object-oriented ...