Questions about polymorphism in PHP

Source: Internet
Author: User
The question about polymorphism in PHP This post was last edited by chenlong451 in Wikipedia from 2013-03-2823: 51: 16. there is a definition about polymorphism: in object-oriented language, many different implementation methods of the interface are Polymorphism. please refer to this article: Questions about polymorphism in PHP
At the end of this post, the definition of polymorphism in Wikipedia was edited by chenlong451 at 23:51:16. in object-oriented languages, the implementation of interfaces is polymorphism.

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Two sample codes are provided in this article. the code segment that uses flow control is as follows:

Class painter {// defines the painter class
Public function paintbrush () {// defines the painter action
Echo "the painter is painting! \ N ";

Class typist {// defines the typist class
Public function typed () {// defines the work of a typist
Echo "Typist Typing! \ N ";

Function printworking ($ obj) {// defines the processing class
If ($ obj instanceof painter) {// if the object is a painter class, the painter action is displayed.
$ Obj-> paintbrush ();
} Elseif ($ obj instanceof typist) {// if the object is a typist class, the typist action is displayed.
$ Obj-> typed ();
} Else {// if the preceding class is not used, the error message is displayed.
Echo "Error: object Error! ";

Printworking (new painter (); // Display employees' work
Printworking (new typist (); // Display employees' work

To demonstrate polymorphism, the following code segment uses polymorphism:

Class employee {// defines the employee parent class
Protected function working () {// defines employee work, which must be implemented in the subclass
Echo "this method needs to be reloaded in the subclass! ";


Class painter extends employee {// defines the painter class
Public function working () {// how to implement inheritance
Echo "the painter is painting! \ N ";

Class typist extends employee {// defines the typist class
Public function working (){
Echo "Typist Typing! \ N ";

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