public function func()
{
$args = func_get_args();
$array = Arrays::removeFirst($args);
$math = $this->_math(isset($args[0]) ? mb_strtoupper($args[0]) : false, $array);
if ($math->return === true) {
return $math->args;
} else {
$this->selectFunctions[] = $math->args;
return $this;
}
}