/**
* The hidden form fields that store a JSON representation of the categories
* for an article.
*/
public function editPageMetadata()
{
$categories = '';
$data = CategoryHelper::getExtractedCategoryData();
if (isset($data) && !empty($data['categories'])) {
$categories = htmlspecialchars(CategoryHelper::changeFormat($data['categories'], 'array', 'json'));
}
$this->response->setVal('categories', $categories);
}
