How to use chain of responsibility pattern in PHP?

The chain of responsibility pattern allows objects that handle requests to be concatenated into a chain, and the request is passed along the chain until an object can handle it. Its benefits include: Modularity: handlers can be easily added and removed. Flexible: The processing order can be easily changed. Scalability: New handlers can be added at any time without modifying existing code.

Chain of responsibility pattern in PHP

Introduction

Chain of responsibility pattern is A design pattern that allows you to link multiple request-handling objects into a chain. When a request occurs, it is passed along the chain until an object is able to handle it.

Benefits

• Modularity: You can add and remove handlers without affecting other objects.
• Flexible: You can easily change the processing order.
• Extensibility: You can add new handlers at any time without modifying existing code.

Code example

interface Handler {
    public function handle(Request $request);
}

class ConcreteHandler1 implements Handler {
    public function handle(Request $request) {
        if ($request->type == 'type1') {
            // 处理请求
            return true;
        } else {
            // 将请求传递给下一个处理程序
            return $this->next->handle($request);
        }
    }
}

class ConcreteHandler2 implements Handler {
    public function handle(Request $request) {
        if ($request->type == 'type2') {
            // 处理请求
            return true;
        } else {
            // 请求不能被处理
            return false;
        }
    }
}

class Client {
    private $handlers;

    public function __construct() {
        $this->handlers = [
            new ConcreteHandler1(),
            new ConcreteHandler2()
        ];
    }

    public function handle(Request $request) {
        foreach ($this->handlers as $handler) {
            if ($handler->handle($request)) {
                break;
            }
        }
    }
}

$request = new Request('type1');
$client = new Client();
$client->handle($request); // 请求被成功处理

Practical case

The chain of responsibility pattern can be used in various applications, For example:

• Validate form input
• Process HTTP requests
• Execute business process

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