Backend Development
PHP Tutorial
Graduation project ppt format introduces the factory pattern in PHP design patterns
Graduation project ppt format introduces the factory pattern in PHP design patterns
Question
How can you create such a "complex" object easily and conveniently without pasting and copying?
Solution
Create a factory (a function or a class method) to create new objects. To understand the usefulness of the factory, imagine the difference below...
Code:
Copy code The code is as follows:
$connection =& new MySqlConnection($user, $password, $database);
...Make your code extensible and more concise...
Copy the code The code is as follows:
$connection =& create_connection();
The latter code snippet focuses on connecting to the database The create_connect() factory, as just mentioned, makes the process of creating a database connection a simple operation - just like the new operation. The advantage of the factory pattern lies in creating objects. Its task is to encapsulate the object creation process and then return a required new class.
Want to change the structure of the object and the way to create the object? You only need to select the object factory and change the code only once. (The function of the factory pattern is so powerful, it is at the bottom of the application, so it will continue to appear in many other complex patterns and applications.)
Sample code
The factory pattern encapsulates the object creation process. You can create an object factory on the object itself or an additional factory class - it depends on your specific application. Let's look at an example of a factory object.
We found that in the following code, the database connection part appears repeatedly:
Copy the code The code is as follows:
// PHP4
class Product {
function getList() { $db =& new MysqlConnection(DB_USER , DB_PW, DB_NAME);
//...
}
function getByName($name) { $db =& new MysqlConnection(DB_USER, DB_PW, DB_NAME);
//...
}
//...
}
You can easily change the parameters for connecting to the database, but you cannot increase or change the order of these parameters unless you change all of the connection code.
You cannot easily instantiate a new class to connect to another database, such as PostgresqlConnection.
This makes it difficult to test and verify the status of the connection object alone.
Using the factory design pattern, the code will be greatly improved:
Copy the code The code is as follows:
class Product {
function getList() {
$db =& $this->_getConnection() ;
//...
}
function &_getConnection() {
return new MysqlConnection(DB_USER, DB_PW, DB_NAME);
}
}
The above introduces the graduation project ppt format and introduces the factory mode in PHP design mode, including the contents of the graduation project ppt format. I hope it will be helpful to friends who are interested in PHP tutorials.
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Alipay PHP SDK transfer error: How to solve the problem of 'Cannot declare class SignData'?
Apr 01, 2025 am 07:21 AM
Alipay PHP...
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,
How does session hijacking work and how can you mitigate it in PHP?
Apr 06, 2025 am 12:02 AM
Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.
Describe the SOLID principles and how they apply to PHP development.
Apr 03, 2025 am 12:04 AM
The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.
How to debug CLI mode in PHPStorm?
Apr 01, 2025 pm 02:57 PM
How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...
Framework Security Features: Protecting against vulnerabilities.
Mar 28, 2025 pm 05:11 PM
Article discusses essential security features in frameworks to protect against vulnerabilities, including input validation, authentication, and regular updates.
How to automatically set permissions of unixsocket after system restart?
Mar 31, 2025 pm 11:54 PM
How to automatically set the permissions of unixsocket after the system restarts. Every time the system restarts, we need to execute the following command to modify the permissions of unixsocket: sudo...
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.
