public function index03Action()
{
echo "<h3 style='color:red;font-weight:bold'>" . __METHOD__ . "</h3>";
$validator = new \Zend\Validator\Digits();
$input = "1";
//ok
$input = -1;
//not
$input = 0;
//ok
if (!$validator->isValid($input)) {
$message = $validator->getMessages();
echo current($message);
} else {
echo "ok";
}
return false;
}
