function hook_preprocess_HOOK

Preprocess theme variables for a specific theme hook.

This hook allows modules to preprocess theme variables for a specific theme hook. It should only be used if a module needs to override or add to the theme preprocessing for a theme hook it didn't define.

For more detailed information, see the Theme system overview topic.

Parameters

$variables: The variables array (modify in place).

Related topics

File

core/lib/Drupal/Core/Render/theme.api.php, line 588

Code

function hook_preprocess_HOOK(&$variables) {
    // This example is from rdf_preprocess_image(). It adds an RDF attribute
    // to the image hook's variables.
    $variables['attributes']['typeof'] = [
        'foaf:Image',
    ];
}