


Detailed explanation of examples of strategy pattern in php (use and definition)
This article mainly introduces the definition and usage of PHP strategy pattern, and briefly analyzes the principle, implementation and usage of PHP strategy pattern in the form of examples. Friends in need can refer to it
The examples in this article describe PHP Strategy pattern definition and usage. Share it with everyone for your reference, the details are as follows:
Overview
The strategy pattern belongs to the behavior pattern of the object. Its intention is to target a set of algorithms and encapsulate each algorithm into an independent class with a common interface so that they can be replaced with each other. The strategy pattern allows the algorithm to change without affecting the client
UML diagram
Main roles in strategy mode
This mode is designed with three roles:
Environment role (Context): Persistence There is a reference to Strategy
Abstract Strategy (Strategy) role: This is an abstract role, usually implemented by an interface or abstract class. This role gives all the interfaces required by specific strategy classes
Specific strategy (ConcreateStrategy) role: wraps related algorithms or behaviors
Used Scenario
Suppose you want to design a shopping cart system now. The simplest case is to multiply the unit price of all goods by the quantity, but the actual situation is definitely more complicated than this. For example: there is no discount for ordinary members, a 20% discount for intermediate members, and a 30% discount for senior members.
According to the above description, the product price is based on one of the following algorithms:
No discount for ordinary members
20% off for intermediate members
7 for senior members Fold
UML diagram
##Implementation code:
<?php /** * 策略抽象类 * @author wzy * */ interface Strategy { public function calPrice ($price); } /** * 普通会员策略类 * * @author wzy * */ class PrimaryStrategy implements Strategy { public function calPrice ($price) { echo "普通会员无折扣"; return $price; } } /** * 中级会员策略类 * * @author wzy * */ class MiddleStrategy implements Strategy { public function calPrice ($price) { echo "中级会员8折优惠"; return $price * 0.8; } } /** * 高级会员策略类 * * @author wzy * */ class HighStrategy implements Strategy { public function calPrice ($price) { echo "高级会员7折优惠"; return $price * 0.7; } } /** * Context实现类 * * @author wzy * */ class Price { /** * 具体的策略类对象 * * @var object */ private $strategyInstance; /** * 构造函数,传入一个具体的策略对象 * * @param object $instance */ public function __construct ($instance) { $this->strategyInstance = $instance; } /** * 计算货品的价格 * * @param double $price */ public function quote ($price) { return $this->strategyInstance->calPrice($price); } } /** * 客户端操作 */ $high = new HighStrategy(); $priceClass = new Price($high); $price = $priceClass->quote(400); echo $price; ?>
Reviewing the Strategy Pattern
The focus of the Strategy Pattern is not how to implement the algorithm, but how Organize and call these algorithms to make the program structure more flexible, better scalable and maintainableEquality of algorithms
A great feature of the strategy model is the equality of each strategy algorithm. For a series of specific strategy algorithms, everyone has the same status, so that mutual conversion between algorithms can be achievedUniqueness of runtime strategies
During operation, the strategy mode can only use one specific strategy implementation object at each moment. Although it can dynamically switch between different strategy implementations, there is only oneat the same time.
The above is the detailed content of Detailed explanation of examples of strategy pattern in php (use and definition). For more information, please follow other related articles on the PHP Chinese website!

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

SublimeText3 Linux new version
SublimeText3 Linux latest version

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 Mac version
God-level code editing software (SublimeText3)