How do you reference images in CSS files within a Symfony 2 project?

Navigating Image Paths in CSS Files in Symfony 2

Problem:

You have CSS files containing paths to images, fonts, and other assets. Your file structure is as follows:

...
+-src/
| +-MyCompany/
|   +-MyBundle/
|     +-Resources/
|       +-assets/
|         +-css/
|           +-stylesheets...
+-web/
| +-images/
|   +-images...
...

You want to reference your images in the stylesheet, but various solutions have proven problematic.

Revised Solution:

1. Split into "Public" and "Private" Directories:

Store your original CSS files in a private directory (e.g., src/Common/DirtyBundle/Resources/assets/css). Copy these files into a public directory before running assetic:dump (e.g., web/bundles/commondirty/css_original).

2. Use Assetic "cssrewrite" Filter (Optional):

This filter is not strictly necessary, but it can simplify path manipulation. If used, be sure to adjust the syntax accordingly.

3. Integrate with Twig:

In your Twig template, reference the CSS files using the appropriate directories and filters:

{% stylesheets 'bundles/commondirty/css_original/container.css' filter="cssrewrite" %}
    <link href="{{ asset_url }}" rel="stylesheet" type="text/css" />
{% endstylesheets %}

{% stylesheets '@CommonDirtyBundle/Resources/assets/css/k.css' filter="cssrewrite" %}
    <link href="{{ asset_url }}" rel="stylesheet" type="text/css" />
{% endstylesheets %}

4. Handle Image Paths:

Use relative or absolute paths to reference images depending on the configuration. For example:

• Relative path: url("../bundles/commondirty/images/devil.png")
• Absolute path: url("/bundles/commondirty/images/devil.png")

5. Maintenance:

After generating the combined CSS file using assetic:dump, you can delete the original CSS files from the public directory if desired.

6. Remaining Constraints:

• Images must be stored in a public directory (e.g., web/bundles/commondirty/images) to be accessible.
• The asset() function will no longer work for original assets in the private directory.

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