Preprocess variables only for certain blocks
Question
Is it possible preprocess variables only for certain blocks?
I have created such function: mytheme_preprocess_block__aggregator(&$vars)
but it doesn't works.
-- EDIT --
It seems to be fixed in Drupal 8 https://drupal.org/node/1751194
Solution
Unfortunately, there is no way to do it like that (similar to hook_form_alter()).
The best way to do this would be to use $variables['block']->bid to apply modifications only to the blocks you want:
function mytheme_preprocess_block(&$variables) {
if ($variables['block']->bid === 'target_block_id') {
// do something for this block
} else if ($variables['block']->bid === 'other_target_block_id') {
// do something else for this other block
}
}
OTHER TIPS
Just to confirm, in Drupal 8 you can write preprocess functions for specific blocks. For example:
Drupal 8
mytheme_preprocess_block__system_branding_block(&$vars) {
// Make changes to the the system branding block
}
But you could also use hook_preprocess_block, and the plugin ID:
function mytheme_preprocess_block(&$vars) {
if ($vars['plugin_id'] == 'system_branding_block') {
// Make changes to the the system branding block
}
}
As mentioned by Alex, in Drupal 7 you'll have to stick with HOOK_preprocess_block, and an id check:
Drupal 7
mytheme_preprocess_block(&$vars) {
if ($vars['block']->bid === 'target_block_id') {
// make changes to this block
}
}
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