A practical guide to middleware for Slim and Phalcon

Guide to using middleware in Slim and Phalcon: Slim: Using the slim/middleware component, create a custom middleware function that verifies whether the user is logged in and redirects or continues execution based on the result. Phalcon: Create a middleware class that implements the Phalcon\Mvc\UserInterface interface, and define the code in the class to be executed before and after the route is executed, and then register the middleware in the application. Practical example: In Slim, create middleware to cache API responses, and in Phalcon, create middleware to record request logs.

Slim and Phalcon’s Practical Guide to Middleware

In modern web development, middleware is a popular technology for processing in applications Execute custom code before or after HTTP requests and generated responses. By using middleware, you can implement various operations such as authentication, caching, logging, and exception handling.

In PHP, Slim and Phalcon are two popular frameworks that provide powerful support for middleware. This article will provide a practical guide on how to use middleware in both frameworks.

Slim

In Slim, middleware can be easily added using the slim/middleware component. To install it:

composer require slim/middleware

Here is a simple authentication middleware example:

<?php

$app->add(function ($request, $response, $next) {
    // 验证用户是否已登录
    if (!isset($_SESSION['user_id'])) {
        return $response->withRedirect('/');
    }

    // 继续执行下一个中间件
    return $next($request, $response);
});

Phalcon

Phalcon has middleware support out of the box. To create middleware in Phalcon, you need to create a class and implement the Phalcon\Mvc\UserInterface interface:

<?php

use Phalcon\Mvc\UserInterface;

class ExampleMiddleware implements UserInterface
{
    public function beforeExecuteRoute($dispatcher)
    {
        // 在执行路由之前执行此代码
    }

    public function afterExecuteRoute($dispatcher)
    {
        // 在执行路由之后执行此代码
    }
}

Then you can register the middleware with your application:

<?php

$middleware = new ExampleMiddleware();

$app->middleware->add(
    $middleware,
    Phalcon\Events\Manager::EVENT_BEFORE_EXECUTE_ROUTE,
    Phalcon\Events\Manager::PRIORITY_LOW
);

Practical case

Use Slim to cache API response

<?php

$app->add(function ($request, $response, $next) {
    $cacheKey = 'api_response_' . $request->getUri()->getPath();
    $response = $cache->get($cacheKey);

    if (!$response) {
        $response = $next($request, $response);
        $cache->set($cacheKey, $response, 3600); // 缓存 1 小时
    }

    return $response;
});

Use Phalcon to record request logs

<?php

use Phalcon\Logger;
use Phalcon\Mvc\UserInterface;

class LoggerMiddleware implements UserInterface
{
    private $logger;

    public function __construct(Logger $logger)
    {
        $this->logger = $logger;
    }

    public function beforeExecuteRoute($dispatcher)
    {
        $this->logger->info('Request: ' . $dispatcher->getActionName() . ' - ' . $dispatcher->getParams());
    }
}

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