function get_login_type()
 {
     if (kekezu::is_email($this->_account)) {
         $this->_account_type = 'email';
     } elseif (kekezu::is_mobile($this->_account)) {
         $this->_account_type = 'mobile';
     } else {
         $this->_account_type = 'username';
     }
     return $this->_account_type;
 }
 function check_username($reg_username)
 {
     global $_lang;
     if (function_exists("filter_var")) {
         if (filter_var($reg_username, FILTER_VALIDATE_EMAIL)) {
             return $_lang['username_can_not_email'];
         }
         if (kekezu::is_mobile($reg_username)) {
             return $_lang['username_can_not_phone_number'];
         }
     } else {
         if (kekezu::is_email($reg_username)) {
             return $_lang['username_can_not_email'];
         }
         if (kekezu::is_mobile($reg_username)) {
             return $_lang['username_can_not_phone_number'];
         }
     }
     $check_username = trim($reg_username);
     if (empty($check_username)) {
         return $_lang['username_is_empty'];
     }
     if (kekezu::k_strpos($check_username)) {
         return $_lang['username_illegal'];
     }
     if (kekezu::check_user_by_name($check_username, 1)) {
         return $_lang['user_has_exist'];
     }
     if ($this->_sys_config['user_intergration'] == 2) {
         $result = keke_user_class::user_checkname($check_username);
         if ($result == -1) {
             return $_lang['username_illegal'];
         } else {
             if ($result == -2) {
                 return $_lang['contain_allow_register_words'];
             } else {
                 if ($result == -3) {
                     return $_lang['username_has_exist'];
                 }
             }
         }
     }
     $limit_username = keke_user_class::user_getprotected();
     if ($limit_username && in_array($check_username, $limit_username)) {
         return $_lang['register_fail_limit_register'];
     }
     return true;
 }