/**
* @return mixed|null|string
*/
public function getPrefixes()
{
$v = parent::getPrefixes();
try {
$n = unserialize($v);
if (!empty($n) and is_array($n)) {
//make sure it's a valid (not empty) prefix
foreach ($n as $key => $value) {
if (!$key) {
unset($n[$key]);
}
}
if (!count($n)) {
$n = null;
}
}
} catch (Exception $e) {
$n = $v;
}
return $n;
}
