Help - SQL to Excel Script Not Working

HI

I have a script I am working on. I want it to export Data from my DB to an Excel Spreadsheet.

<?php require_once('Connections/Connection.php'); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
 if (PHP_VERSION < 6) {
   $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
 }

 $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

 switch ($theType) {
   case "text":
     $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
     break;    
   case "long":
   case "int":
     $theValue = ($theValue != "") ? intval($theValue) : "NULL";
     break;
   case "double":
     $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
     break;
   case "date":
     $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
     break;
   case "defined":
     $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
     break;
 }
 return $theValue;
}
}

mysql_select_db($database_Connection, $Connection);
$query_testdata = "SELECT * FROM testdata";
$testdata = mysql_query($query_testdata, $Connection) or die(mysql_error());
$row_testdata = mysql_fetch_assoc($testdata);
$totalRows_testdata = mysql_num_rows($testdata);mysql_select_db($database_Connection, $Connection);
$query_testdata = "SELECT * FROM testdata";
$testdata = mysql_query($query_testdata, $Connection) or die(mysql_error());
$row_testdata = mysql_fetch_assoc($testdata);
$totalRows_testdata = mysql_num_rows($testdata);
$query_testdata = "SELECT * FROM testdata ORDER BY ID DESC";
$testdata = mysql_query($query_testdata, $Connection) or die(mysql_error());
$row_testdata = mysql_fetch_assoc($testdata);
$totalRows_testdata = mysql_num_rows($testdata);

//feed the final array to our formatting function...
$contents = getExcelData($testdata);

$filename = "myExcelFile.xls";

//prepare to give the user a Save/Open dialog...
header ("Content-type: application/octet-stream");
header ("Content-Disposition: attachment; filename=".$filename);

//setting the cache expiration to 30 seconds ahead of current time. an IE 8 issue when opening the data directly in the browser without first saving it to a file
$expiredate = time() + 30;
$expireheader = "Expires: ".gmdate("D, d M Y G:i:s",$expiredate)." GMT";
header ($expireheader);

//output the contents
echo $contents;
exit;
?>
<?php
function getExcelData($data){
   $retval = "";
   if (is_array($data)  && !empty($data))
   {
    $row = 0;
    foreach(array_values($data) as $_data){
     if (is_array($_data) && !empty($_data))
     {
         if ($row == 0)
         {
             // write the column headers
             $retval = implode("\t",array_keys($_data));
             $retval .= "\n";
         }
          //create a line of values for this row...
             $retval .= implode("\t",array_values($_data));
             $retval .= "\n";
             //increment the row so we don't create headers all over again
             $row++;
      }
    }
   }
 return $retval;
}

mysql_free_result($testdata);
?>

I have two Issues.

It does not seem to work. When I export it, I just seems to create a blank excel doc. Not Sure Why?

I would also really like to be able to add a title to my excel doc, before my data shows

I hope someone can help me and I would really appreciate it.