if ($nickname && !Validate::string($nickname, array('min_length' => 1,
'max_length' => 64,
'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {
if ($nickname && !Validate::string($nickname, array('min_length' => 1,
'max_length' => 64,
'format' => VALIDATE_NUM . VALIDATE_ALPHA_LOWER))) {