So we define the function with this hook...

 * Implements hook_preprocess_bean().
function MODULE_preprocess_bean(&$variables) {

  // Attach css...

  return $variables;

What can this be attached to please?

$variables['SOMETHING']['#attached']['css'][] = drupal_get_path('module', 'MODULE') . '/MODULE.css';

2 Answers 2


It can be attached to whatever you like - the important thing is that you render it.

So you could quite simply use:

$foo['#attached']['css'][] = drupal_get_path('module', 'MODULE') . '/MODULE.css';

Or stick it in a var like you're already doing:

$variables['SOMETHING']['#attached']['css'][] = drupal_get_path('module', 'MODULE') . '/MODULE.css';

And in the template:


It works because drupal_render() unconditionally calls drupal_process_attached() on any element it finds with an #attached property, regardless of what you're doing with the result of the render (or if there's even anything to render).

  • 1
    Sorry only just got back, great explanation @Clive, thanks for this, especially about drupal_render() where it calls drupal_process_attached(), didnt know this!
    – Alex Gill
    Mar 10, 2015 at 14:50

You can attach CSS files using the dedicated function drupal_add_css :

 drupal_add_css(drupal_get_path('module', 'MODULE') . '/MODULE.css');

By the way, you don't have to return your $variables since it's passed by reference.

I hope that help :)

  • 3
    The #attached method has been preferred for quite a while - this will work, but isn't so good for caching, and won't future-proof the code for Drupal 8
    – Clive
    Mar 10, 2015 at 13:18

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