New in Symfony 2.7: the new Asset component

Contributed by Fabien Potencier in #13234

Prior to Symfony 2.7, web asset management was done in the Templating component. The design of that subsystem suffered from some errors (it required the request scope because it relied on the Request instance) and limitations (for example in the management of secure base URLs).

In order to solve those issues, Symfony 2.7 introduces a new component called Asset. Management of web assets is now decoupled from the Templating component, which allows to reuse it outside of Symfony (for example in the Silex microframework).

The new Asset component manages URL generation and versioning of web assets such as CSS stylesheets, JavaScript files and image files. This means that your templates become less verbose and your application is more flexible, because you can change the location and version of your assets just with a few minor changes in a configuration file.

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# Symfony 2.6
# app/config/config.yml
framework:
    templating:
        assets_version: 'v5'
        assets_version_format: '%%s?version=%%s'
        assets_base_urls:
            http: ['http://cdn.example.com']
            ssl:  ['https://secure.example.com']
        packages:
            # ...

# Symfony 2.7
# app/config/config.yml
framework:
    assets:
        version: 'v5'
        version_format: '%%s?version=%%s'
        base_path: ~
        base_urls: ['http://cdn.example.com', 'https://secure.example.com']
        packages:
            # ...

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{# Symfony 2.6 #}
{{ asset('logo.png', absolute = true) }}

{# Symfony 2.7 #}
{{ absolute_url(asset('logo.png')) }}


{# Symfony 2.6 #}
{{ asset('logo.png', version = 'v5') }}

{# Symfony 2.7 (do nothing, version is automatically appended) #}
{{ asset('logo.png') }}

{# use the asset_version() function if you need to output it manually #}
{{ asset_version('logo.png') }}

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# app/config/config.yml
framework:
    assets:
        packages:
            app:
                base_path: /bundles/app/
            img:
                base_path: /bundles/app/images/

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{{ asset('images/me.png', 'app') }}
{# /bundles/app/images/me.png #}

{{ asset('me.png', 'img') }}
{# /bundles/app/images/me.png #}

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# app/config/config.yml
framework:
    assets:
        version: 'v5'
        version_format: '%%s?version=%%s'
        packages:
            avatar:
                base_path: /img/avatars
            doc:
                base_path: /docs/pdf
                version_format: '%2$s/%1$s'

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{{ asset(user.uuid ~ '.png', 'avatar') }}
{# /img/avatars/1b0ae6a5-1c39-4b49-bcc1-2a787c8ec139.png?version=v5 #}

{{ asset('contracts/signup.pdf', 'doc') }}
{# /v5/docs/pdf/contracts/signup.pdf #}

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# app/config/config.yml
framework:
    assets:
        base_urls:
            - 'http://static1.example.com/images/'
            - 'https://static2.example.com/images/'

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{{ asset('logo.png') }}
{# in a regular page: http://static1.example.com/images/logo.png #}
{# in a secure page:  https://static2.example.com/images/logo.png #}