A detailed introduction to _php example based on the factory model in PHP design pattern

Source: Internet
Author: User
Tags abstract

Factory Pattern: The factory class determines which instance of the production class is created based on the parameters.
Factory class: A method class that is designed to create other objects. That is, on demand, the incoming parameters are selected to return the specific class
Actions: An object-created encapsulation that simplifies the creation of an object, a method of invoking a factory class to get the required class
1. Main roles
: Abstract products (product), specific products (concrete product), Abstract factory role (Creator)
2. Advantages and Disadvantages
Advantage: The factory method model allows the system to introduce heart products without modifying the factory role
Disadvantage: Customers may have to create a creator subclass just to create a specific concrete product object
3. Applicability
When a class does not know the object it must create
When a class wants its subclasses to make the objects it creates
When a class delegates the responsibility of creating an object to one of several helper subclasses, and hopefully you will be the one that helps the subclass to be a proxy for this information localization

Copy Code code as follows:

Class myobject{
Public Function __construct () {}
Public Function test () {
return ' test ';
Class myfactory{
public static function factory () {
return new MyObject ();

$myObject = Myfactory::factory ();
echo $myObject->test ();

? <?php
Abstract classes define attributes and abstract methods
Abstract class operation{
protected $_numbera = 0;
protected $_numberb = 0;
protected $_result= 0;

Public function __construct ($A, $B) {
$this->_numbera = $A;
$this->_numberb = $B;

Public Function Setnumber ($A, $B) {
$this->_numbera = $A;
$this->_numberb = $B;

Public Function Clearresult () {
$this->_result = 0;

Abstract protected function getresult ();

Action class
Class Operationadd extends operation{
Public Function GetResult () {
$this->_result = $this->_numbsera + $this->_numberb;
return $this->_result;

Class Operationsub extends operation{
Public Function GetResult () {
$this->_result = $this->_numbera-$this->_numberb;
return $this->_result;

Factory class
Class operationfactory{
private static $obj;

public static function Creationoperation ($type, $A, $B) {
Switch ($type) {
Case ' + ':
Self:: $obj = new Operationadd ($A, $B);
Case '-':
Self:: $obj = new Operationsub ($A, $B);

$obj = operationfactory:: creationoperation (' + ', 5,6);
echo $obj-> getresult ();

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.