How to use controller filters in PHPixie framework?

PHPixie is a lightweight PHP framework that adopts the MVC (Model-View-Controller) architecture pattern. Implementing controller filters in PHPixie is very simple, it provides a set of built-in filters and allows you to create custom filters to handle your project needs.

This article will introduce readers to how to use controller filters in the PHPixie framework.

1. What is a controller filter?

A controller filter is a block of code that can be executed before or after a controller method is executed. Filters can be used to validate input data, check user permissions, log transactions, or any other similar operation.

In PHPixie, filters are implemented based on a component called Filtre. Filtre contains a set of methods that enable you to create and execute filters.

2. PHPixie’s built-in filters

PHPixie provides a variety of built-in filters, which can be used to perform the following operations:

1. Check whether you are logged in

2. Check user role

3. Check CSRF token

4.Exception handling

5.Clean input value

6. Record execution time

7. Verify input parameters

8. Cache response

3. Use filters in the controller

In PHPixie , you can decorate your controller methods with filters. By using filters, you can execute a block of code before or after the controller's method execution.

Here are some examples:

public function actionIndex() {

$this->response->body = 'Hello, World!';

}

A filter named check_logged_in will be executed before this method:

protected $filters = array(
'check_logged_in'
);

public function actionIndex() {

$this->response->body = 'Hello, World!';

}

public function filter_check_logged_in () {

if (!$this->auth->logged_in()){
$this->redirect('login');
}
}

A filter named record_time will be executed after this method:

protected $filters = array(
'record_time'
);

public function actionIndex() {

$this->response->body = 'Hello, World!';

}

public function filter_record_time() {

$time = microtime(true) - $this->request->time;
$this->log('Time taken: '. number_format($time, 6) .' seconds. ');
}

When this method is executed, the filters will be executed in order. If an exception is triggered in the filter, execution will be interrupted and an error response will be returned.

4. Create a custom filter

Creating a custom filter is very simple, just override the on() method of the Filtre class. In this method, you can write custom logic to handle the execution of the filter.

The following is an example:

class MyFilter extends PHPixieFiltre {

public function on() {

if ($this->request-> ;param('id') == 0) {
$this->redirect('error');
}
}

}

Now, This custom filter can be used in the controller:

protected $filters = array(
'my_filter'
);

public function actionIndex() {

$this->response->body = 'Hello, World!';

}

Note that you must pass it in the __construct() method of the controller Filters are registered with the filter factory to instantiate the filter.

class Controller_Index extends PHPixieController {

public function __construct($request, $response) {
parent::__construct($request, $response);
$this-> ;filters->register('my_filter', new MyFilter($this->components()));
}

}

Summary

Pass Using controller filters, you can easily implement input validation, authentication, data cleaning and other functions in PHPixie. This article explains PHPixie's built-in filters, how to use them in controllers, and how to write custom filters.

Mastering the use of controller filters is one of the important parts of PHPixie development and can improve the performance and security of your web application.

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