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This article mainly shows you "PHP in the face of object programming example analysis", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "PHP face object programming polymorphism example analysis" this article.

What is polymorphism?

Polymorphism, which comes from the definition of dictionary.com, "occurs in different forms, stages, or types in independent organizations or in the same organization, without fundamental differences." From this definition, we can think of polymorphism as a programming way to describe the same object through multiple states or stages. In fact, its real meaning is that in actual development, we only need to focus on the programming of an interface or base class, without worrying about the specific class to which an object belongs (class).

If you are familiar with design patterns, even if you have a preliminary understanding, then you will understand the concept. In fact, PHP5 polymorphism is probably the greatest tool in pattern-based programming. It allows us to organize similar objects in a logical way so that we don't have to worry about the specific type of object when coding; moreover, we only need to program a desired interface or base class. The more abstract an application is, the more flexible it appears-- and polymorphism is one of the best ways to abstract behavior.

For example, let's consider a class called Person. We can subclass Person with classes called David,Charles and Alejandro. Person has an abstract method AcceptFeedback () that all subclasses implement. This means that any code that uses a subclass of the base class Person can call the method AcceptFeedback (). You don't have to check whether the object is a David or an Alejandro, just know that it is a Person. As a result, your code only needs to focus on the "lowest common denominator"-Person class.

The Person class in this example can also be created as an interface. Of course, there are some differences from the above, mainly in that an interface does not give any behavior, but only a set of rules. A Person interface requires that "you must support the AddFeedback () method," while a Person class can provide some default code for the AddFeedback () method-your understanding can be "if you choose not to support AddFeedback (), then you should provide a default implementation." How to choose an interface or base class is not the subject of this article; however, in general, you need to implement a default method through the base class. If you can simply outline a set of desired functions that your class wants to implement, you can also use an interface.

Popular understanding

The most direct definition of polymorphism is that different objects with inheritance relationships can be called on member functions with the same name to produce different response results.

Polymorphic code

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