Symfony
sponsored by SensioLabs
Menu
  • About
  • Documentation
  • Screencasts
  • Cloud
  • Certification
  • Community
  • Businesses
  • News
  • Download
  1. Home
  2. Documentation
  3. Service Container
  4. How to Work with Compiler Passes
  • Documentation
  • Book
  • Reference
  • Bundles
  • Cloud
Search by Algolia
  • Working with Compiler Passes in Bundles

How to Work with Compiler Passes

Edit this page

Warning: You are browsing the documentation for Symfony 5.1, which is no longer maintained.

Read the updated version of this page for Symfony 6.2 (the current stable version).

How to Work with Compiler Passes

Compiler passes give you an opportunity to manipulate other service definitions that have been registered with the service container. You can read about how to create them in the components section "Compiling the Container".

Compiler passes are registered in the build() method of the application kernel:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
// src/Kernel.php
namespace App;

use App\DependencyInjection\Compiler\CustomPass;
use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    // ...

    protected function build(ContainerBuilder $container): void
    {
        $container->addCompilerPass(new CustomPass());
    }
}

One of the most common use-cases of compiler passes is to work with tagged services. In those cases, instead of creating a compiler pass, you can make the kernel implement CompilerPassInterface and process the services inside the process() method:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
// src/Kernel.php
namespace App;

use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;

class Kernel extends BaseKernel implements CompilerPassInterface
{
    use MicroKernelTrait;

    // ...

    public function process(ContainerBuilder $container): void
    {
        // in this method you can manipulate the service container:
        // for example, changing some container service:
        $container->getDefinition('app.some_private_service')->setPublic(true);

        // or processing tagged services:
        foreach ($container->findTaggedServiceIds('some_tag') as $id => $tags) {
            // ...
        }
    }
}

Working with Compiler Passes in Bundles

Bundles can define compiler passes in the build() method of the main bundle class (this is not needed when implementing the process() method in the extension):

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
// src/MyBundle/MyBundle.php
namespace App\MyBundle;

use App\DependencyInjection\Compiler\CustomPass;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\HttpKernel\Bundle\Bundle;

class MyBundle extends Bundle
{
    public function build(ContainerBuilder $container): void
    {
        parent::build($container);

        $container->addCompilerPass(new CustomPass());
    }
}

If you are using custom service tags in a bundle then by convention, tag names consist of the name of the bundle (lowercase, underscores as separators), followed by a dot, and finally the "real" name. For example, if you want to introduce some sort of "transport" tag in your AcmeMailerBundle, you should call it acme_mailer.transport.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
We stand with Ukraine.
Version:
Save your teams and projects before they sink

Save your teams and projects before they sink

Code consumes server resources. Blackfire tells you how

Code consumes server resources. Blackfire tells you how

↓ Our footer now uses the colors of the Ukrainian flag because Symfony stands with the people of Ukraine.

Avatar of Iqbal Malik, a Symfony contributor

Thanks Iqbal Malik (@iqbal_malik89) for being a Symfony contributor

1 commit • 39 lines changed

View all contributors that help us make Symfony

Become a Symfony contributor

Be an active part of the community and contribute ideas, code and bug fixes. Both experts and newcomers are welcome.

Learn how to contribute

Symfony™ is a trademark of Symfony SAS. All rights reserved.

  • What is Symfony?
    • Symfony at a Glance
    • Symfony Components
    • Case Studies
    • Symfony Releases
    • Security Policy
    • Logo & Screenshots
    • Trademark & Licenses
    • symfony1 Legacy
  • Learn Symfony
    • Symfony Docs
    • Symfony Book
    • Reference
    • Bundles
    • Best Practices
    • Training
    • eLearning Platform
    • Certification
  • Screencasts
    • Learn Symfony
    • Learn PHP
    • Learn JavaScript
    • Learn Drupal
    • Learn RESTful APIs
  • Community
    • SymfonyConnect
    • Support
    • How to be Involved
    • Code of Conduct
    • Events & Meetups
    • Projects using Symfony
    • Downloads Stats
    • Contributors
    • Backers
  • Blog
    • Events & Meetups
    • A week of symfony
    • Case studies
    • Cloud
    • Community
    • Conferences
    • Diversity
    • Documentation
    • Living on the edge
    • Releases
    • Security Advisories
    • SymfonyInsight
    • Twig
    • SensioLabs
  • Services
    • SensioLabs services
    • Train developers
    • Manage your project quality
    • Improve your project performance
    • Host Symfony projects
    Deployed on
Follow Symfony
Search by Algolia