ช่วยดูโค๊ดออกรายงานกราฟโดยดึงข้อมูลจาก Mysql แล้วไม่เป็นภาษาไทย ให้หน่อยจ้าหาที่แก้ไม่เจอเลย

<?php
require("../jpgraph/src/jpgraph.php"); //this is path of tool
require("../jpgraph/src/jpgraph_bar.php");
require("../jpgraph/src/jpgraph_flags.php");
include ("../dbconnect.php");

$sql1 ="SELECT personnel.per_name, paymentextra_load.net, paymentextra_load.per_id 
FROM paymentextra_load INNER JOIN personnel ON  paymentextra_load.per_id=personnel.per_id  ";
$result = mysql_query($sql1)
or die("query error 1 ".mysql_error()); 

while ($rs = mysql_fetch_array($result)){ 
$xdata[] = $rs["per_name"];
$ydata[] = $rs["net"];

}
$graph = new Graph(650,550);
$graph->SetScale("textlin");
$graph->SetMarginColor('white');
$graph->SetBackgroundGradient("white","whitesmoke",GRAD_HOR, BGRAD_MARGIN);
$graph->SetShadow();
$graph->SetMargin(60,50,40,60);

$graph->title->SetFont(FF_ANGSA,FS_BOLD,20);
$graph->title->Set(iconv('TIS-620','UTF-8',"รายงานยอดเงินรวม"));
$graph->subtitle->SetFont(FF_ANGSA,FS_BOLD,20);
$graph->subtitle->Set(iconv('TIS-620','UTF-8',"ค่าสอนพิเศษ"));

$graph->xaxis->title->Set(iconv('TIS-620','UTF-8',"ชื่อ"));
$graph->xaxis->title->SetFont(FF_ANGSA,FS_BOLD,18);
$graph->yaxis->title->Set("Bath");
$graph->xaxis->SetTickLabels($xdata);
$graph->SetMarginColor('white');
$graph->SetBackgroundGradient("white","whitesmoke",GRAD_HOR, BGRAD_MARGIN);

$bplot = new BarPlot($ydata);
$bplot->SetFillGradient('white','orchid',GRAD_VERT);
$bplot->SetColor('gainsboro');
$bplot->SetWeight(1);
$bplot->value->Show();
$bplot->value->SetFont(FF_ANGSA,FS_BOLD,15);
$bplot->value->SetAngle(45);

$graph->Add($bplot);

$graph->Stroke();
?>