Undefined function WA_eCDB_ConvertNumber()

Getting this error when I add the add cart summary to database function: Undefined function


Here my code, can anybody help me. Thanks!

<?php
// WA eCart Store Cart Summary in Db
if (!$eCart1->IsEmpty()) // Trigger
{
$WA_connection = $con_kenhome;
$WA_table = "donhang";
$WA_redirectURL = "";
$WA_indexField = "mdh";
$WA_fieldNamesStr = "OrderReferenceID|mkh|ngaydathang";
$WA_fieldValuesStr = WA_eCDB_ConvertNumber("".session_id() ."") . "|" . WA_eCDB_ConvertNumber("".$_SESSION['mkh'] ."") . "|" . "Now()";
$WA_columnTypesStr = "none,none,NULL|none,none,NULL|',none,''";
$WA_sessionName = "order_id";
$WA_Sql = "";
$NeedInsert = false;
$indexFieldIndex = -1;
$WA_fieldValues = explode("|", $WA_fieldValuesStr);
$WA_columns = explode("|", $WA_columnTypesStr);
$WA_connectionDB = $database_con_kenhome;
$updateFieldValue = "";
mysql_select_db($WA_connectionDB, $WA_connection);
if (!session_id()) session_start();
if ($WA_redirectURL != "" && isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] !== "" && sizeof($_POST) > 0) {
$WA_redirectURL .= ((strpos('?', $WA_redirectURL) === false)?"?":"&").$_SERVER["QUERY_STRING"];
}
$WA_fieldNames = explode("|", $WA_fieldNamesStr);
$WA_columns = explode("|", $WA_columnTypesStr);
for ($i = 0; $i < sizeof($WA_fieldNames); $i++)
{
if ($WA_indexField == $WA_fieldNames[$i])
{
$indexFieldIndex = $i;
break;
}
}
$deleteFieldValue = "";
$updateColType = "none,none,NULL";
if ($indexFieldIndex >= 0) $updateFieldValue = $WA_fieldValues[$indexFieldIndex];
if ($updateFieldValue == "" && isset($_SESSION[$WA_sessionName])) $updateFieldValue = $_SESSION[$WA_sessionName];
if ($indexFieldIndex >= 0) $updateColType = $WA_columns[$indexFieldIndex];
if ($updateFieldValue != "") {
$updateParamsObj = WA_generateInsertParams($WA_fieldNames, $WA_columns, $WA_fieldValues, $indexFieldIndex);
$valueForWhere = WA_generateInsertParams(array($WA_indexField), array($updateColType), array($updateFieldValue), -1);
$WA_Sql = "update " . $WA_table . " SET " . $updateParamsObj->WA_setValues . " where " . $WA_indexField . " = " . $valueForWhere->WA_dbValues;
$WA_editCmd = mysql_query($WA_Sql, $WA_connection) or die(mysql_error());
$_SESSION[$WA_sessionName] = $updateFieldValue;
$result = mysql_query("SELECT * FROM " . $WA_table . " where " . $WA_indexField . " = " . $valueForWhere->WA_dbValues, $WA_connection);
$num_rows = mysql_num_rows($result);
$NeedInsert = (mysql_num_rows($result) === 0);
}
if ($updateFieldValue === "" || $NeedInsert) {
$updateFieldValue = "";
$insertParamsObj = WA_generateInsertParams($WA_fieldNames, $WA_columns, $WA_fieldValues, -1);
$WA_Sql = "insert into " . $WA_table . " (" . $insertParamsObj->WA_tableValues . ") values (" . $insertParamsObj->WA_dbValues . ")";
$WA_editCmd = mysql_query($WA_Sql, $WA_connection) or die(mysql_error());
$_SESSION[$WA_sessionName] = mysql_insert_id();
}
if ($WA_redirectURL != "") {
header("Location: ".$WA_redirectURL); exit;
}
}
?>