Getting Started with PHP: Proxy Mode

PHP Getting Started Guide: Proxy Pattern

The proxy pattern is a common design pattern that controls access to other objects by providing a proxy for these objects. The proxy object acts as an intermediary for the original object, providing a controlled access channel to the original object. In this article, we will introduce the implementation and use of the PHP proxy pattern, hoping to provide PHP beginners with a detailed guide to the proxy design pattern.

1. What is proxy mode?

The proxy pattern is used in software design to provide a replacement or placeholder for an object. A proxy object can perform certain operations on behalf of the original object without affecting the original object. The proxy pattern is widely used in software design, especially in web applications.

2. Types of agent modes

Agent modes can be divided into several types: virtual agent, remote agent, protection agent and intelligent agent.

2.1 Virtual Agent

A virtual agent is a proxy that acts as a representative of the original object. The virtual proxy creates the original object when needed and forwards all requests to it. Using virtual proxies, you can defer operations while the original object is created and initialized, improving system performance and responsiveness.

2.2 Remote proxy

Remote proxy is a proxy that allows local objects to access remote objects. Using a remote agent, objects on a remote server can be accessed over the network and operated on the client computer.

2.3 Protection Agent

A protection agent is a proxy that restricts access to the original object. Protection proxies protect the state and behavior of the original object, allowing access only to specific client objects.

2.4 Smart Proxy

A smart proxy is a proxy that can better handle some common business logic, such as caching, lazy loading, and access control. Smart proxies can run specific behaviors when a request arrives, and can dynamically select a specific implementation at runtime.

3. PHP Proxy Pattern Example

Let’s look at a simple example using the proxy pattern. Suppose there is a Movie interface that contains two methods: play() and stop(), an OriginalMovie that implements this Movie interface, and a MovieProxy class that acts as a proxy to control access to the OriginalMovie object.

3.1 Interface and original class

interface Movie {
    public function play();
    public function stop();
}

class OriginalMovie implements Movie {
    public function play() {
        echo "Playing the movie
";
    }

    public function stop() {
        echo "Stopping the movie
";
    }
}

3.2 Proxy class

class MovieProxy implements Movie {
    private $movie;

    public function __construct(Movie $movie) {
        $this->movie = $movie;
    }

    public function play() {
        echo "Logging the play time
";
        $this->movie->play();
    }

    public function stop() {
        echo "Logging the stop time
";
        $this->movie->stop();
    }
}

Now, we can use the MovieProxy class to proxy the OriginalMovie object and call play() and stop() method, add some logging.

$originalMovie = new OriginalMovie();
$movieProxy = new MovieProxy($originalMovie);

$movieProxy->play(); // Logging the play time, Playing the movie
$movieProxy->stop(); // Logging the stop time, Stopping the movie

4. Summary

The proxy pattern is a design pattern widely used in software design. It controls the control of other objects by providing a proxy for these objects. Access. The proxy object acts as an intermediary for the original object, providing a channel for controlled access. In PHP, using the proxy mode can greatly improve the maintainability, scalability and reusability of the code.

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