มีปัญหา เมื่อ Export to Excel แล้วชื่อคอลัมที่กำหนดเป็นภาษาไทย กลายเป็นภาษาต่างดาวคับ?

<?
require_once "class/class.writeexcel_workbook.inc.php";
require_once "class/class.writeexcel_worksheet.inc.php";


$host="localhost";
$username="root";
$password="1234";
$dbname="icaddy_db";
$link=mysql_connect($host,$username,$password);
mysql_connect("$host","$username","$password") or die ("CAN NOT CONNECT TO SERVER");
mysql_query("SET NAMES	tis620");
mysql_select_db($dbname,$link) or die ("CAN NOT TO FINE DATABASE");

$fname= "Report.xls";
$workbook =& new writeexcel_workbook($fname);

$worksheet =& $workbook->addworksheet("Report");
$worksheet->set_margin_right(0.50);
$worksheet->set_margin_bottom(1.10);

## Set Format ##

$xlscelldesc_header =& $workbook->addformat();
$xlscelldesc_header->set_font('MS Sans Serif');
$xlscelldesc_header->set_size(10);
$xlscelldesc_header->set_color('blue');
$xlscelldesc_header->set_bold(1);
$xlscelldesc_header->set_text_v_align(1);
$xlscelldesc_header->set_merge(1);

$xlsCellDesc =& $workbook->addformat();
$xlsCellDesc->set_font('MS Sans Serif');
$xlsCellDesc->set_size(8);
$xlsCellDesc->set_color('black');
$xlsCellDesc->set_align('left');
$xlsCellDesc->set_text_v_align(1);

## End of Set Format ##



## Set Column Width & Height กำหนดความกว้างของ Cell

$worksheet->set_column('A:A', 10);
$worksheet->set_column('B:B', 10);
$worksheet->set_column('C:C', 20);
$worksheet->set_column('D:D', 10);
$worksheet->set_column('E:E', 10);
$worksheet->set_column('F:F', 10);
$worksheet->set_column('G:G', 10);
$worksheet->set_column('H:H', 10);
$worksheet->set_column('I:I', 10);
$worksheet->set_column('J:J', 10);
$worksheet->set_column('K:K', 22);
$worksheet->set_column('L:L', 8);


$celldesc_h = 16.50;


## Writing Data เพิ่มข้อมูลลงใน Cell



# กำหนดความสูงของ Cell

$worksheet->set_row(1, $celldesc_h); 

$worksheet->set_row(2, $celldesc_h);

$worksheet->set_row(3, $celldesc_h);

$worksheet->set_row(4, $celldesc_h);

$worksheet->set_row(5, $celldesc_h);




$worksheet->write(G3, " title",$xlscelldesc_header);
$worksheet->write_blank(F6,$xlscelldesc_header);


$worksheet->write(A5,"No.", $xlscelldesc_header); 
$worksheet->write(B5,"Golfer ID", $xlscelldesc_header); 
$worksheet->write(C5,"Name Golfer", $xlscelldesc_header); 
$worksheet->write(D5,"Telephone", $xlscelldesc_header);
$worksheet->write(E5,"โทร.1", $xlscelldesc_header);
$worksheet->write(F5,"โทร.2", $xlscelldesc_header);
$worksheet->write(G5,"โทร.3", $xlscelldesc_header);
$worksheet->write(H5,"โทร.4", $xlscelldesc_header);
$worksheet->write(I5,"โทร.5", $xlscelldesc_header);
$worksheet->write(J5,"ทีม", $xlscelldesc_header);
$worksheet->write(K5,"อีเมล์", $xlscelldesc_header);
$worksheet->write(L5,"เพศ", $xlscelldesc_header);

$xlsRow = 6;



# ตรงนี้คือดึงข้อมูลจาก mysql มาใส่ใน Cell
$sql="select golferID,name,telephone,telephone1,telephone2,telephone3,telephone4,telephone5,teamID,sex,email from golfer"; 

$query=mysql_query($sql);
$num=mysql_num_rows($query);
if($num==0){
echo "ไม่พบข้อมูล";
print "<meta http-equiv=refresh content='0;URL=admin_1.php'>"; 

exit();
}else{
$count=1;
				while($result= mysql_fetch_array($query)){
++$i;  


$worksheet->set_row($xlsRow, 19.80);
$worksheet->write("A$xlsRow", $count, $xlsCellDesc);
$worksheet->write("B$xlsRow", $result["golferID"], $xlsCellDesc); // ติดที่ตัวนี้ ถ้าไม่ใส่ \r ตัวข้างหน้าจะไม่มีช่องว่าง แต่เลข 0 ข้างหน้า จะถูกตัดทิ้งไป
$worksheet->write("C$xlsRow", "\r".$result["name"], $xlsCellDesc);
$worksheet->write("D$xlsRow", "\r".$result["telephone"], $xlsCellDesc); 
$worksheet->write("E$xlsRow", "\r".$result["telephone1"], $xlsCellDesc);
$worksheet->write("F$xlsRow", "\r".$result["telephone2"], $xlsCellDesc);
$worksheet->write("G$xlsRow", "\r".$result["telephone3"], $xlsCellDesc);
$worksheet->write("H$xlsRow", "\r".$result["telephone4"], $xlsCellDesc);
$worksheet->write("I$xlsRow", "\r".$result["telephone5"], $xlsCellDesc);
$worksheet->write("J$xlsRow", $result["teamID"], $xlsCellDesc);
$worksheet->write("K$xlsRow", $result["email"], $xlsCellDesc);
$worksheet->write("L$xlsRow", $result["sex"], $xlsCellDesc);
$count=$count+1;
$xlsRow++;


}
}

# เสร็จแล้วก็ส่งไฟล์ไปยัง Browser ครับแค่นี้ก็เสร็จแล้ว

$workbook->close();

header("Pragma:  no-cache");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); 
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header("Content-Disposition: attachment; filename=".basename("Report_Golfer.xls").";");
header("Content-Type: text/html; charset=tis-620");
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($fname));
readfile($fname); 
unlink($fname);

exit();

?>

$worksheet->write(K5,"อีเมล์", $xlscelldesc_header);
$worksheet->write(L5,"เพศ", $xlscelldesc_header);