[API] "Возможные значения" TV параметра

<?php
$brands = $modx->db->query('SELECT tv.elements FROM modx_site_tmplvars as tv WHERE tv.id = 21');
$brands = $modx->db->makeArray($brands);

$brand = explode('||',$brands[0]['elements']);
echo '<select>';
foreach ($brand as $name) {
    $name = explode('==',$name);
    echo '<option value="'.$name[1].'">'.$name[0].'</option>';
}
echo '</select>';
?>