template_preprocess_book_all_books_block(&$variables)
Prepares variables for book listing block templates.
Default template: book-all-books-block.html.twig.
All non-renderable elements are removed so that the template has full access to the structured data but can also simply iterate over all elements and render them (as in the default template).
array $variables: An associative array containing the following key:
function template_preprocess_book_all_books_block(&$variables) { // Remove all non-renderable elements. $elements = $variables['book_menus']; $variables['book_menus'] = array(); foreach (Element::children($elements) as $index) { $variables['book_menus'][] = array( 'id' => $index, 'menu' => $elements[$index], 'title' => $elements[$index]['#book_title'], ); } }
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https://api.drupal.org/api/drupal/core!modules!book!book.module/function/template_preprocess_book_all_books_block/8.1.x