search
HomeBackend DevelopmentPHP TutorialLearn PHP design patterns PHP implements the adapter pattern_php skills

1. Intention
Convert the interface of a class into another interface desired by the client. The Adapter mode allows classes that were originally unable to work together due to incompatible interfaces to work together
2. Adapter pattern structure diagram

3. Main characters in adapter mode
Target role: Defines the interface used by the client related to a specific domain. This is what we expect
Source (Adaptee) role: interface that needs to be adapted
Adapter role: Adapt the Adaptee interface and the Target interface; the adapter is the core of this model. The adapter converts the source interface into the target interface. This role is a concrete class
4. Applicable Scenarios of Adapter Mode
1. You want to use an existing class, but its interface does not meet your needs
2. You want to create a reusable class that can work with other unrelated or unforeseen classes
3. You want to use an existing subclass, but it's not possible to subclass each one to match their interface. Object adapter can adapt to its parent class interface (object adapter only)
5. Class Adapter Pattern and Object Adapter
Class adapter: Adapter and Adaptee are inheritance relationships
1. Use a specific Adapter class to match the Target. The result is that when we want to match a class and all its subclasses, the class Adapter will not do the job
2. Allow Adapter to redefine some behaviors of Adaptee, because Adapter is a subset of Adaptee
3. Only introduce an object, no additional pointers are needed to indirectly obtain the adaptee
Object adapter: Adapter and Adaptee are in a delegation relationship
1. Allow one Adapter to work with multiple Adaptee at the same time. Adapter can also add functions to all Adaptees at once
2. It is difficult to redefine the behavior of Adaptee
Adapter pattern and other patterns
Bridge mode (bridge mode): The bridge mode is similar to the object adapter, but the starting point of the bridge mode is different: the purpose of the bridge mode is to separate the interface part and the implementation part, so that they can be changed relatively easily and relatively independently. The object adapter pattern means changing the interface of an existing object
Decorator mode (decorator mode): Decoration mode enhances the functionality of other objects without changing its interface. Decoration mode therefore provides better transparency to the application than adapters.
6. Class Adapter Pattern PHP Example
Class adapters use inheritance

<&#63;php
/**
 * 目标角色
 */
interface Target {
 
  /**
   * 源类也有的方法1
   */
  public function sampleMethod1();
 
  /**
   * 源类没有的方法2
   */
  public function sampleMethod2();
}
 
/**
 * 源角色
 */
class Adaptee {
 
  /**
   * 源类含有的方法
   */
  public function sampleMethod1() {
    echo 'Adaptee sampleMethod1 <br />';
  }
}
 
/**
 * 类适配器角色
 */
class Adapter extends Adaptee implements Target {
 
  /**
   * 源类中没有sampleMethod2方法,在此补充
   */
  public function sampleMethod2() {
    echo 'Adapter sampleMethod2 <br />';
  }
 
}
 
class Client {
 
  /**
   * Main program.
   */
  public static function main() {
    $adapter = new Adapter();
    $adapter->sampleMethod1();
    $adapter->sampleMethod2();
 
  }
 
}
 
Client::main();
&#63;>

7. Object Adapter Pattern PHP Example
The object adapter uses delegation

<&#63;php
/**
 * 目标角色
 */
interface Target {
 
  /**
   * 源类也有的方法1
   */
  public function sampleMethod1();
 
  /**
   * 源类没有的方法2
   */
  public function sampleMethod2();
}
 
/**
 * 源角色
 */
class Adaptee {
 
  /**
   * 源类含有的方法
   */
  public function sampleMethod1() {
    echo 'Adaptee sampleMethod1 <br />';
  }
}
 
/**
 * 类适配器角色
 */
class Adapter implements Target {
 
  private $_adaptee;
 
  public function __construct(Adaptee $adaptee) {
    $this->_adaptee = $adaptee;
  }
 
  /**
   * 委派调用Adaptee的sampleMethod1方法
   */
  public function sampleMethod1() {
    $this->_adaptee->sampleMethod1();
  }
 
  /**
   * 源类中没有sampleMethod2方法,在此补充
   */
  public function sampleMethod2() {
    echo 'Adapter sampleMethod2 <br />';
  }
 
}
 
class Client {
 
  /**
   * Main program.
   */
  public static function main() {
    $adaptee = new Adaptee();
    $adapter = new Adapter($adaptee);
    $adapter->sampleMethod1();
    $adapter->sampleMethod2();
 
  }
 
}
 
Client::main();
&#63;>

The above is the code to implement the adapter mode using PHP. There are also some conceptual distinctions about the adapter mode. I hope it will be helpful to everyone's learning.

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
How can you check if a PHP session has already started?How can you check if a PHP session has already started?Apr 30, 2025 am 12:20 AM

In PHP, you can use session_status() or session_id() to check whether the session has started. 1) Use the session_status() function. If PHP_SESSION_ACTIVE is returned, the session has been started. 2) Use the session_id() function, if a non-empty string is returned, the session has been started. Both methods can effectively check the session state, and choosing which method to use depends on the PHP version and personal preferences.

Describe a scenario where using sessions is essential in a web application.Describe a scenario where using sessions is essential in a web application.Apr 30, 2025 am 12:16 AM

Sessionsarevitalinwebapplications,especiallyfore-commerceplatforms.Theymaintainuserdataacrossrequests,crucialforshoppingcarts,authentication,andpersonalization.InFlask,sessionscanbeimplementedusingsimplecodetomanageuserloginsanddatapersistence.

How can you manage concurrent session access in PHP?How can you manage concurrent session access in PHP?Apr 30, 2025 am 12:11 AM

Managing concurrent session access in PHP can be done by the following methods: 1. Use the database to store session data, 2. Use Redis or Memcached, 3. Implement a session locking strategy. These methods help ensure data consistency and improve concurrency performance.

What are the limitations of using PHP sessions?What are the limitations of using PHP sessions?Apr 30, 2025 am 12:04 AM

PHPsessionshaveseverallimitations:1)Storageconstraintscanleadtoperformanceissues;2)Securityvulnerabilitieslikesessionfixationattacksexist;3)Scalabilityischallengingduetoserver-specificstorage;4)Sessionexpirationmanagementcanbeproblematic;5)Datapersis

Explain how load balancing affects session management and how to address it.Explain how load balancing affects session management and how to address it.Apr 29, 2025 am 12:42 AM

Load balancing affects session management, but can be resolved with session replication, session stickiness, and centralized session storage. 1. Session Replication Copy session data between servers. 2. Session stickiness directs user requests to the same server. 3. Centralized session storage uses independent servers such as Redis to store session data to ensure data sharing.

Explain the concept of session locking.Explain the concept of session locking.Apr 29, 2025 am 12:39 AM

Sessionlockingisatechniqueusedtoensureauser'ssessionremainsexclusivetooneuseratatime.Itiscrucialforpreventingdatacorruptionandsecuritybreachesinmulti-userapplications.Sessionlockingisimplementedusingserver-sidelockingmechanisms,suchasReentrantLockinJ

Are there any alternatives to PHP sessions?Are there any alternatives to PHP sessions?Apr 29, 2025 am 12:36 AM

Alternatives to PHP sessions include Cookies, Token-based Authentication, Database-based Sessions, and Redis/Memcached. 1.Cookies manage sessions by storing data on the client, which is simple but low in security. 2.Token-based Authentication uses tokens to verify users, which is highly secure but requires additional logic. 3.Database-basedSessions stores data in the database, which has good scalability but may affect performance. 4. Redis/Memcached uses distributed cache to improve performance and scalability, but requires additional matching

Define the term 'session hijacking' in the context of PHP.Define the term 'session hijacking' in the context of PHP.Apr 29, 2025 am 12:33 AM

Sessionhijacking refers to an attacker impersonating a user by obtaining the user's sessionID. Prevention methods include: 1) encrypting communication using HTTPS; 2) verifying the source of the sessionID; 3) using a secure sessionID generation algorithm; 4) regularly updating the sessionID.

See all articles

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

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

Atom editor mac version download

Atom editor mac version download

The most popular open source editor

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools