public static function renderSelect(Field $field)
{
if (strpos($field->getName(), '[]') || is_array($field->getValue())) {
$field->setAttribute('multiple', 'multiple');
}
$selected = is_array($field->getValue()) ? $field->getValue() : [$field->getValue()];
$select = sprintf('<select name="%s" %s>', $field->getName(), $field->getAttributes());
foreach ($field->getChoices() as $value => $choice) {
if (is_array($choice)) {
if (empty($choice)) {
continue;
}
$select .= sprintf('<optgroup label="%s">', $value);
foreach ($choice as $subvalue => $subchoice) {
$select .= sprintf('<option value="%s" %s>%s</option>', $subvalue, in_array($subvalue, $selected) ? ' selected="selected"' : '', $subchoice);
}
$select .= '</optgroup>';
} else {
$select .= sprintf('<option value="%s" %s>%s</option>', $value, in_array($value, $selected) ? ' selected="selected"' : '', $choice);
}
}
return $select . '</select>';
}
