PHP observer pattern implementation code-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

PHP observer pattern implementation code

小云云

Feb 12, 2018 am 10:36 AM

phpcode

This article mainly introduces the observer pattern implemented in PHP. It analyzes the definition and usage of the observer pattern in PHP based on specific examples. Friends in need can refer to it. I hope it can help everyone.

<?php
  //定义观察者调用接口
  class transfer{
    protected $_observers = array();
    //注册对象
    public function register($sub){
      $this->_observers[] = $sub;
    }
    //外部统一调用
    public function trigger(){
      if(!empty($this->_observers)){
        foreach($this->_observers as $observer){
          $observer->update();
        }
      }
    }
  }
  //观察者接口
  interface obserable{
    public function update();
  }
  //实现观察者
  class listen implements obserable{
    public function update(){
      echo &#39;now first time you need to do listen<br/>&#39;;
    }
  }
  class read implements obserable{
    public function update(){
      echo &#39;now first time you need to read<br/>&#39;;
    }
  }
  class speak implements obserable{
    public function update(){
      echo &#39;now first time you need to speak<br/>&#39;;
    }
  }
  class write implements obserable{
    public function update(){
      echo &#39;now first time you need to write<br/>&#39;;
    }
  }
  $transfer = new transfer();
  $transfer->register(new listen());
  $transfer->register(new read());
  $transfer->register(new speak());
  $transfer->register(new write());
  $transfer->trigger();

Related recommendations:

Detailed explanation of JavaScript observer pattern examples

NodeJS singleton pattern , Adapter pattern, Decoration pattern, Observer pattern summary

Detailed explanation of PHP design pattern Observer pattern

The above is the detailed content of PHP observer pattern implementation code. For more information, please follow other related articles on the PHP Chinese website!

Statement

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

PHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AM

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 and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AM

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.

Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AM

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 and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AM

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.

PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AM

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

How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AM

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.

How does PHP handle object cloning (clone keyword) and the __clone magic method?Apr 17, 2025 am 12:24 AM

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP vs. Python: Use Cases and ApplicationsApr 17, 2025 am 12:23 AM

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.

See all articles