public function preprocess(&$vars)
{
parent::preprocess($vars);
$vars['selected'] = [];
if (isset($vars['attrs']['multiple']) && $vars['attrs']['multiple'] && isset($vars['value']) && is_array($vars['value'])) {
foreach ($vars['value'] as $selected) {
$vars['selected'][$selected] = TRUE;
}
} elseif (isset($vars['value']) && !is_array($vars['value'])) {
$vars['selected'][$vars['value']] = TRUE;
}
$vars['select_attrs'] = NULL;
$tag_attributes = [];
foreach ($vars['attrs'] as $attr => $val) {
$tag_attributes[] = sprintf('%s = "%s"', $attr, $val);
}
$vars['select_attrs'] = implode(' ', $tag_attributes);
}
