SQL: joomla tag title output

gistfile1

<?php
    // Initialiase variables.
    $db = JFactory::getDbo();
    foreach ($item->getValue('art_tags') as $key => $tag) {
        if ($key >= 0) {

        // Use following line in a model.
        $query.$key = $db->getQuery(true);
        // Prepare query.
        $query.$key->select('u.id,u.parent_id,u.path,u.title');
        $query.$key->from('#__tags As u');

        $query.$key->where('u.id='.$db->quote($tag));
        // Inject the query and load the result.
        $result.$key = $db->setQuery($query.$key)->loadRow();
        //print_r($result.$key);
        // Format Output
        echo '<span class="tag">'.$result.$key[3].'</span>';
        }
    }
 ?>