Create a Bundle 

Create a Bundle Manually 

First you need to specify name and namespace of your bundle. Symfony framework already has best practices for bundle structure and bundle name and we recommend to follow these practices and use them.

Let us assume that we want to create the AcmeDemoBundle and put it under the namespace Acme\Bundle\DemoBundle in the /src directory. We need to create the corresponding directory structure and the bundle file with the following content:

src/Acme/Bundle/DemoBundle/AcmeDemoBundle.php 
namespace Acme\Bundle\DemoBundle;

use Symfony\Component\HttpKernel\Bundle\Bundle;

class AcmeDemoBundle extends Bundle
{
}

Basically, it is a regular Symfony bundle. The only difference is in the way it will be enabled (see chapter Enable a Bundle).

Create a Bundle Service Container Extension 

For a load configuration files you need to create Service Container Extension. See Symfony Configuration Files

src/Acme/Bundle/DemoBundle/DependencyInjection/AcmeDemoExtension.php 
namespace Acme\Bundle\DemoBundle\DependencyInjection;

use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Loader;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;

class AcmeDemoExtension extends Extension
{
    public function load(array $configs, ContainerBuilder $container)
    {
        $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
        // register services configuration
        $loader->load('services.yml');
        // register other configurations in the same way
    }
}

Create basic Resources/config/services.yml for define service parameters. See Symfony Service Parameters

src/Acme/Bundle/DemoBundle/Resources/config/services.yml 
 services:

Enable a Bundle 

Now you have all the required files to enable the new bundle. To enable the bundle:

  1. Create a Resources/config/oro/bundles.yml file with the following content:

src/Acme/Bundle/DemoBundle/Resources/config/oro/bundles.yml 
bundles:
    - { name: Acme\Bundle\DemoBundle\AcmeDemoBundle, priority: 255 }

This file provides a list of bundles to register. All such files are automatically parsed to load the required bundles.

  1. Regenerate the application cache using console command cache:clear:

    user@host:/var/www/vhosts/platform-application$ php bin/console cache:clear
Clearing the cache for the dev environment with debug true

    Note

    If you are working in production environment, use parameter --env=prod with the command.

  2. Check if your bundle is registered and active with following command:

    php bin/console debug:container --parameter=kernel.bundles --format=json | grep AcmeDemoBundle

    Note

    Replace grep argument with your bundle’s proper name

  3. When your bundle is registered and active, the following output (or a similar one) will be displayed in the console after running the command:

    "AcmeDemoBundle": "Acme\\Bundle\\DemoBundle\\AcmeDemoBundle",

References