วิธี set ค่า JpGraph ให้เป็นภาษาไทยคับ เห็นมีคนคนถามไว้เยอะอยู่ เลยมาบอกวิธีทำ

<?php // content="text/plain; charset=utf-8"

define('TTF_DIR',dirname(__FILE__).'/fonts/');
include ("jpgraph/jpgraph.php");
include ('jpgraph/jpgraph_pie.php');
include ('jpgraph/jpgraph_pie3d.php');
require_once("configuration/connectiondb.inc.php");

$sid	=	424;
$qid	=	1;
$data = array();
$labels= array();

$sql  =	" SELECT survey_id, question_id, answer_id FROM analysis_of_response ";
$sql .=	" WHERE survey_id = '$sid' AND question_id = '$qid' GROUP BY answer_id ";
$obj 	= mysql_query($sql);

	$sql2	  = " SELECT answer_text FROM survey_answers ";
	$sql2 .= " WHERE survey_id = '$sid' AND question_id = '$qid' ";
	$obj2  = mysql_query($sql2);
	
	$sql3  = " SELECT question_details FROM questions ";
	$sql3 .= " WHERE survey_id = '$sid' ";
	$obj3 = mysql_query($sql3);
	$rw3 = mysql_fetch_array($obj3);
	$title	=	iconv('TIS-620','UTF-8',$rw3['question_details']); // SET กราฟเป็น ภาษาไทย

$i = 0;
$j = 0;
while($rw = mysql_fetch_array($obj)) {

	$data[$i]	= iconv('TIS-620', 'UTF-8', $rw['answer_id']);
	$i++;
}	

while($rw2 = mysql_fetch_array($obj2)){
	$labels[$j] = iconv('TIS-620', 'UTF-8', $rw2['answer_text']);
	$j++;
}	

// Create the Pie Graph.
$graph = new PieGraph(350,200);
$graph->SetShadow();

// Set A title for the plot
$graph->title->Set($title);
$graph->title->SetFont(FF_ANGSA,FS_BOLD,18); 
$graph->title->SetColor("darkblue");
$graph->legend->Pos(0.1,0.2);

// Create 3D pie plot
$p1 = new PiePlot3d($data);
$p1->SetTheme("sand");
$p1->SetCenter(0.4);
$p1->SetSize(80);

// Adjust projection angle
$p1->SetAngle(45);

// As a shortcut you can easily explode one numbered slice with
$p1->ExplodeSlice(3);

// Setup the slice values
$p1->value->SetFont(FF_ANGSA,FS_BOLD,12);
$p1->value->SetColor("navy");

$p1->SetLegends($labels);

$graph->Add($p1);
$graph->Stroke();

?>