public function xtprintnull($arr)
{
foreach ($arr as $k => $v) {
if (is_array($v)) {
$backarr[$k] = Tool_Fnc::xtprintnull($v);
} else {
$backarr[$k] = strlen($v) <= 0 ? " " : $v;
}
}
return $backarr;
}