function UserChecked ( $login, $password ) {
  $conn = &ADONewConnection("ado_mssql");
  $myDSN="PROVIDER=MSDASQL;DRIVER={SQL Server};SERVER=MSH;DATABASE=BASA_617;UID=;PWD=;";
  $conn->Connect($myDSN);
  $userIP = $_SERVER['REMOTE_ADDR'];
  $sql_param = "SELECT * FROM PASSWORDS_BASA WHERE uLogin='$login' AND uPassword='$password' AND uIP_Address='$userIP'";
  $result = $conn->Execute($sql_param);
  $rows = $result->RecordCount('PASSWORDS_BASA', "uLogin = '$login' AND uPassword = '$password' AND uIP_Address='$userIP'");
  if ( $rows ==  1  ) return  1 ;
     else return  0 ;
}

  if ( UserChecked ( $PHP_AUTH_USER, $PHP_AUTH_PW ) ==  0  ) {
     Header("WWW-authenticate: basic realm=\"Зона администратора\"");
     Header("HTTP/1.1 401 Unauthorized");
     echo "В ДОСТУПЕ ОТКАЗАНО!!\n";
     exit;
  }
...