How to use Phalcon framework in PHP

With the continuous development of the Internet, Web development technology continues to innovate, and PHP has become a very popular Web development language. Among PHP frameworks, Phalcon is a very popular framework. Phalcon is known as a fast and efficient framework because Phalcon encapsulates many functions in the form of C language, which greatly improves the performance of the framework.

This article will introduce how to use the Phalcon framework, mainly including the following content:

1. Install the Phalcon extension
2. Create a Phalcon project
3. Configuration and routing
4. Controller and view
5. Database operation

1. Install Phalcon extension

There are two ways to install Phalcon: compile and install and use Precompiled binaries. Since compilation and installation are complicated, we recommend using precompiled binaries.

Download the operating system version that suits you from the official website https://phalcon.io/en-us/. The PHP version needs to be consistent with your PHP version. After downloading, unzip it to the ext folder in the PHP installation directory, and add the following content to the php.ini file:

extension=phalcon.so

After restarting the server, you can use phpinfo () function to check whether the installation is successful.

2. Create a Phalcon project

The Phalcon project is created using command line tools. You need to install Phalcon DevTools first. Use the following command to install:

composer require phalcon/devtools

After successful installation, use the following command to create a new project:

phalcon create-project myproject

where myproject is the name of your project. After the creation is completed, you will find that in your project Several directories and files are automatically generated in the directory:

app directory: the storage directory for controllers, views and models
config directory: the storage directory for all configuration files
public directory: Web entry file (index.php) and static file storage directory

3. Configuration and routing

Phalcon’s configuration file is stored in the config.php file in the config directory, and some basic configurations can be performed. For example, database connection, etc.:

return [

'database' => [
    'adapter' => 'Mysql',
    'host' => 'localhost',
    'username' => 'root',
    'password' => '123456',
    'dbname' => 'mydatabase'
]

];

Phalcon’s routing configuration is also very simple. The routing rules are stored in the app/config/router.php file:

$router->add(

"/",
[
    'controller' => 'index',
    'action' => 'index'
]

);

The above configuration will forward the root directory request to the index method of the index controller.

4. Controller and View

The controller handles the request and renders the view. Controllers are stored in the app/controllers directory. Phalcon stipulates that the controller class name must end with Controller, such as IndexController.

IndexController code example:

use PhalconMvcController;

class IndexController extends Controller
{

public function indexAction()
{
    $this->view->message = 'Hello Phalcon!';
}

}

View files are stored in the app/views directory. Phalcon uses the Volt template engine by default. For simple pages, you can use PHP code directly.

index.volt file example:

<title>Welcome to Phalcon!</title>

<h1>{{ message }}</h1>

The relationship between the controller and the view is automatically established by Phalcon when the request is sent to the controller , the controller calls the corresponding operation according to the routing rules and passes the data to the view.

5. Database Operation

The Phalcon framework provides a simple and powerful ORM. Database operations can be easily performed using Phalcon ORM. First, configure the database connection information in config.php, and then directly use methods such as Model::find() to query the database.

For example, we need to query all users in the users table:

$users = Users::find();

foreach ($users as $user) {

echo $user->username;

}

Phalcon also supports building complex query expressions, for example:

$users = Users::find([

"conditions" => "status = :status:",
"bind" => [
    "status" => "active",
],
"order" => "created_at DESC",
"limit" => 10,

]);

For more complex database operations, you can use Phalcon QueryBuilder or directly execute native SQL statements.

Summary:

The above is the introduction of the Phalcon framework and the explanation of how to use it. As a fast and efficient framework, Phalcon is of great help in building high-performance Web applications. If you are looking for a high-performance PHP framework, Phalcon is a good choice.

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