What are the types of design patterns in PHP?

Design patterns in PHP provide repeatable solutions to common problems in software development. They are classified by type, including creational patterns (used to create objects), structural patterns (used to organize and combine objects), and behavioral patterns (used to define object interactions). Among them, the singleton pattern ensures that there is only one instance of the class, thereby improving the reusability and maintainability of the code.

Design patterns in PHP

Introduction

Design patterns are Reusable solutions to common problems commonly seen in software development. It helps developers create more flexible, maintainable and extensible code by providing predefined templates.

Design pattern types in PHP

PHP supports various design patterns, including:

• Creative patterns: Used to create objects.
• Structural pattern: Used to organize and combine objects.
• Behavioral pattern: Used to define the communication and collaboration methods between objects.

Practical case: singleton mode

Purpose: Ensure that only one object instance can be created for a certain class.

PHP Code:

class Singleton
{
    private static $instance;

    private function __construct() {}

    public static function getInstance(): Singleton
    {
        if (!self::$instance) {
            self::$instance = new Singleton();
        }

        return self::$instance;
    }
}

$instance1 = Singleton::getInstance();
$instance2 = Singleton::getInstance();

if ($instance1 === $instance2) {
    echo "Instances are identical." . PHP_EOL;
} else {
    echo "Instances are different." . PHP_EOL;
}

Output:

Instances are identical.

Advantages:

• Ensure there is only one instance of the class in the application.
• Helps control resource consumption and avoid conflicts.
• Improve the reusability and maintainability of code.

Other design pattern types

• Creative patterns: Factory method, abstract factory, builder, prototype
• Structural patterns: Adapters, bridges, combinations, decorators, appearances
• Behavioral patterns: Commands, interpreters, iterators, observers ,Strategy

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