function getPostByGroup($dbslug, $offset, $limit)
{
$bucket = array();
/* limit for groups #1,2 and 3 */
$limitMap = array(0 => 8, 1 => 4, 2 => 2);
if (!Util::tryEmpty($dbslug)) {
$slugs = explode(Constants::SPACE, $dbslug);
$count = 0;
foreach ($slugs as $slug) {
if (Util::tryEmpty($slug)) {
continue;
}
/* fetch only one post beyond group #3 */
$limit = $count <= 2 ? $limitMap[$count] : 1;
$ids = $this->getMatch("post_groups", $slug, $offset, $limit);
// @imp order matters for array_diff
// bucket should always be second argument!
$unique = Util::fast_array_diff($ids, $bucket);
$bucket = array_merge($bucket, $unique);
$count++;
}
}
return $bucket;
}