If you have a theme function like theme_field() for instance. I know you can do something like this:

function THEMENAME_preprocess_field(&$varialbes) {

and that will print out the all the variables (if you have Devel enabled). Then I see theme_hook_suggestions like this "field__field_date__featured_event". However, when I try to do this:

function THEMENAME_preprocess_field__field_date__featured_event(&$varialbes) {

The above does not work at all. Why is this? Is it possible to use a preprocess function on a theme suggestion? or are theme suggestions just for theme overrides and not for preprocessing?



1 Answer 1


You need to do this before you can do that...

 * Implements hook_preprocess_field().
function YOURTHEME_preprocess_field(&$vars) {
    if ($vars['SOME_FIELD']) {
        $function = 'YOURTHEME_preprocess_field__'.$vars['SOME_FIELD'];
        if (function_exists($function)) {
  • so there isn't a way to use the theme suggestions to automatically preprocess things? Then what's the point of them? thanks! Nov 7, 2012 at 15:52
  • Think your getting confused with the conventions for templates. theme_hook_suggestions are suggestions templates, not hooks.
    – Alex Gill
    Nov 7, 2012 at 15:59
  • 1
    @DavidBarratt Alex is right, they're for template files, not for preprocess functions. theme_hook_suggestions are added in a preprocess function, so for them to also affect other preprocess functions could easily introduce a nasty in-escapable loop
    – Clive
    Nov 7, 2012 at 16:11
  • 1
    It's actually a bug drupal.org/node/939462 Nov 7, 2012 at 18:36
  • @barraponto Thanks I haven't come across that one before, I just assumed it was like that by design
    – Clive
    Nov 7, 2012 at 18:47

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