getTagIDs

<?php
$master = !empty($master)?$master:$modx->resource->id;

$tq = $modx->newQuery('TaggerTagResource');
$tq->select('tag');
$tq->where(array(
    'resource' => $master
));
$tq->groupby('tag');

if ($tq->prepare() && $tq->stmt->execute()) {
    return $tq->stmt->fetchAll(PDO::FETCH_COLUMN);
}

return false;