How to use middleware in FatFree framework?

FatFree is a lightweight PHP framework designed to quickly build small web applications. Although FatFree is simpler and easier to use than other PHP frameworks, its middleware support is very clever and powerful. This article will introduce in detail how to use middleware in the FatFree framework.

First of all, we need to clarify the role of middleware. Middleware can perform some processing between requests and responses, which can be access control, caching, logging, etc. In the FatFree framework, middleware is designed to modify requests and responses, or provide additional processing logic. Among them, the request refers to the information sent by the client to the server, and the response refers to the information the server responds to the client.

The FatFree framework uses a stack to store middleware. When a request comes, the middleware will process the request in sequence and finally return a response. The order in which middleware is executed is determined by the order in which they appear on the stack. Therefore, if you need to execute middleware sequentially, you need to add them to the stack in reverse order.

The following is a simple example. Suppose we need to record the request start and end time in each request, and add an "X-Response-Time" header to the response. We can use the following code:

$f3 = Base::instance();

//添加中间件
$f3->before('/*', function($f3) {
    $f3->set('startTime', microtime(true));
});

$f3->after('/*', function($f3) {
    $endTime = microtime(true);
    $responseTime = $endTime - $f3->get('startTime');
    $f3->set('responseTime', $responseTime);

    header('X-Response-Time: ' . $responseTime);
});

$f3->run();

In the above code, we define two middlewares. The first middleware logs the request start time before each request. The second middleware adds an "X-Response-Time" header to the response and sets the response time as part of the response data.

In the FatFree framework, middleware can be divided into two types: global middleware and routing middleware. Global middleware takes effect on all requests, while routing middleware only takes effect on requests for specified routes.

Global middleware can be added using the F3::before and F3::after methods, while routing middleware needs to define the route first and then add it.

The following is an example of routing middleware. In this example, we need to process the request when accessing the "/api" route.

$f3->route('GET /api', function($f3) {
    $f3->send('hello world');
})
->before(function($f3) {
    //处理逻辑
});

In the above code, we define a route with the route "/api" and add a middleware in front of the route.

Finally, it should be noted that middleware can access all functions of the FatFree framework, including databases, caches, etc. This allows the middleware to complete more processing logic.

To sum up, the middleware mechanism of the FatFree framework is very powerful and can greatly save developers’ time and energy. Whether it is global middleware or routing middleware, they can be flexibly defined and configured to meet a variety of needs. Therefore, if you need to build a small web application, the FatFree framework is an option worth considering.

The above is the detailed content of How to use middleware in FatFree framework?. For more information, please follow other related articles on the PHP Chinese website!