Table of Contents
A software that has many Classes need to call each other. Once a class has a tightly coupled relationship with another class, the reusability of the software will be greatly reduced. Therefore, the reusability of a software depends on its degree of coupling. " >A software that has many Classes need to call each other. Once a class has a tightly coupled relationship with another class, the reusability of the software will be greatly reduced. Therefore, the reusability of a software depends on its degree of coupling.
Home Backend Development PHP Tutorial Coupled design pattern in PHP

Coupled design pattern in PHP

Apr 28, 2018 pm 01:42 PM
php Design Patterns

This article mainly introduces the coupling design pattern for implementing PHP. It has a certain reference value. Now I share it with you. Friends in need can refer to it.

A software that has many Classes need to call each other. Once a class has a tightly coupled relationship with another class, the reusability of the software will be greatly reduced. Therefore, the reusability of a software depends on its degree of coupling.

Coupling degree: the degree of association and dependence between program modules.

During the design process, it was proposed: When designing the architecture of this software, it was discovered that the logical operation part (SimpleRouter class) and the output part (SimpleRouterFrame class) of this software cannot be well combined. That is: we have to pass the reference to the program interface (reference to SimpleRouterFrame) layer by layer to the core part of the program to provide the output function.

During the development process, it was proposed: When we make some modifications to the output interface (SimpleRouterFrame class), especially after the names of some methods are modified, the code in the core part of the corresponding program (SimpleRouter class) also needs to be modified. to adapt to this new output interface.

Cause of the problem: The coupling between classes is too tight, so that every time a class needs to be modified, its corresponding associated class needs to modify the code to adapt to the modified class. For example: a certain class A needs to directly call the public method of another class B. Once B no longer supports this method, or rewrites the method name, A will need to rewrite the code to adapt. Another situation: A certain class A needs to use a class B with a specific method, but the form of B is uncertain. Once the internal structure of B changes, A may need to rewrite the code.

To avoid this situation, it is necessary to reduce the coupling between A and B. Regardless of the form, as long as B can still achieve the functions required by A, A does not need to rewrite the code. Solution: Let B implements a certain interface I and defines I.Method(); at the same time, A can directly call I's method when calling B's method; in the past, B would be passed to A as a parameter, and then A would call B's method. Place

1    {      
2        A.AMethod(B b ) {      
3            b.BMethod();      
4            /*….*/      
5        }      
6    }
Copy after login

is modified to:

1    {      
2        A.AMethod(I i ) {      
3            i.Method();      
4        }      
5    }
Copy after login

Here, B only needs to implement the I.Method() method, completely hiding the implementation details. According to this method, loose coupling between classes is achieved and the reusability of classes is greatly enhanced. Looking back at the design patterns we have learned before, we can find that they are similar to the Observer pattern.

下面是一个完整的例子:



001    <?php    
002    interface Calculation {    
003        function compute($a, $b);    
004    }    
005         
006    class Addition implements Calculation {    
007        function compute($a, $b)    
008        {    
009            return "加法运算结果为:".($a+$b);    
010        }    
011    }    
012         
013    class Subtraction implements Calculation {    
014        function compute($a, $b)    
015        {    
016            return "减法运算结果为:".($a-$b);    
017        }    
018    }    
019         
020    class Multiplication implements Calculation {    
021        function compute($a, $b)    
022        {    
023            return "乘法运算结果为:".($a*$b);    
024        }    
025    }    
026         
027    class pision implements Calculation{    
028        function compute($a, $b)    
029        {    
030            return "除法运算结果为:".($a/$b);    
031        }    
032    }    
033         
034    class Modf implements Calculation {    
035        function compute($a, $b)    
036        {    
037            return "取模运算结果为:".($a % $b);    
038        }    
039    }    
040         
041    class Coupling implements Calculation {    
042        //这里直接:public $varl = new LazyDog(); 会出错。    
043        public $varl = null;    
044             
045        function __construct()    
046        {    
047            $this->varl = new LazyDog();    
048        }    
049             
050        function compute($a, $b)    
051        {    
052            return $this->varl->say();    
053        }    
054    }    
055         
056    /*也可以用继承的方式实现哟:    
057    class Coupling extends LazyDog implements Calculation {    
058        function compute($a, $b)    
059        {    
060            return parent::say();    
061        }    
062    }    
063    */    
064         
065    class LazyDog {    
066        function say()    
067        {    
068            return "我什么运算都不做...只是为了实现&#39;耦合设计模式&#39;...我是出来打酱油的......";    
069        }    
070    }    
071         
072    class Test {    
073        private $one;    
074        private $two;    
075        public function __construct($x,$y)    
076        {    
077            $this->one=$x;    
078            $this->two=$y;    
079            echo "Class Test 初始化:属性\$one=".$this->one.",属性\$two=".$this->two."<h />";    
080       }    
081       function display(Calculation $a){    
082            return "用PHP接口技术实现的运算:".$a->compute($this->one,$this->two)."<hr/>";    
083       }    
084    }    
085         
086    $t = new Test(96,12);    
087    $t1 = new Addition();    
088    $t2 = new Subtraction();    
089    $t3 = new Multiplication();    
090    $t4 = new pision();    
091    $t5 = new Modf();    
092         
093    $dog = new Coupling();    
094         
095    echo $t->display($t1);    
096    echo $t->display($t2);    
097    echo $t->display($t3);    
098    echo $t->display($t4);    
099    echo $t->display($t5);    
100         
101    echo $t->display($dog);    
102         
103    ?>
Copy after login

程序运行结果:


1    Class Test 初始化:属性$one=96,属性$two=12    
2    用PHP接口技术实现的运算:加法运算结果为:108    
3    用PHP接口技术实现的运算:减法运算结果为:84    
4    用PHP接口技术实现的运算:乘法运算结果为:1152    
5    用PHP接口技术实现的运算:除法运算结果为:8    
6    用PHP接口技术实现的运算:取模运算结果为:0    
7    用PHP接口技术实现的运算:我什么运算都不做...只是为了实现&#39;耦合设计模式&#39;...我是出来打酱油的......
Copy after login

相关推荐:

PHP的标准库


The above is the detailed content of Coupled design pattern in PHP. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

7 PHP Functions I Regret I Didn't Know Before 7 PHP Functions I Regret I Didn't Know Before Nov 13, 2024 am 09:42 AM

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

PHP Program to Count Vowels in a String PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

How do you parse and process HTML/XML in PHP? How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

See all articles