ฟังก์ชั่น GetSQLValueString() เออเร่อตอนอัพเดทครับ Fatal error: Call to undefined function GetSQLValueString()

mysql_select_db($database_localhost, $localhost);
if ((isset($_POST["event"])) && ($_POST["event"] == "update")) {
  $updateSQL = sprintf("UPDATE student SET id_number=%s, passwd=%s, name_student=%s, born=%s, house_no=%s, swine=%s, street=%s, province=%s, district=%s, sub_district=%s, tel=%s, mail=%s, id_branch=%s, time_education=%s, time_graduation=%s, degree=%s WHERE id_auto=%s",
                       GetSQLValueString($_POST['id_number'], "text"),
                       GetSQLValueString($_POST['passwd'], "text"),
                       GetSQLValueString($_POST['name_student'], "text"),
                       GetSQLValueString($_POST['born'], "text"),
                       GetSQLValueString($_POST['house_no'], "text"),
                       GetSQLValueString($_POST['swine'], "text"),
                       GetSQLValueString($_POST['street'], "text"),
                       GetSQLValueString($_POST['province'], "text"),
                       GetSQLValueString($_POST['district'], "text"),
                       GetSQLValueString($_POST['sub_district'], "text"),
                       GetSQLValueString($_POST['tel'], "text"),
                       GetSQLValueString($_POST['mail'], "text"),
                       GetSQLValueString($_POST['id_branch'], "int"),
                       GetSQLValueString($_POST['time_education'], "text"),
                       GetSQLValueString($_POST['time_graduation'], "text"),
                       GetSQLValueString($_POST['degree'], "text"),
                       GetSQLValueString($_POST['id_auto'], "int"));

  $Result1 = mysql_query($updateSQL, $localhost) or die(mysql_error());

  $updateGoTo = "index.php";
  if (isset($_SERVER['QUERY_STRING'])) {
    $updateGoTo .= (strpos($updateGoTo, '?')) ? "&" : "?";
    $updateGoTo .= $_SERVER['QUERY_STRING'];
  }
  header(sprintf("Location: %s", $updateGoTo));
}