Help Me ! How To Create jpGraph In Loop

Code:
&lt;?php if( !defined('BASEPATH')) exit('No direc script access allowed');



class Test extends CI_Controller{



 function __construct(){

  parent::__construct(); 

  require_once PUBPATH.'jpgraph/jpgraph.php';

  require_once PUBPATH.'jpgraph/jpgraph_pie.php';

  require_once PUBPATH.'jpgraph/jpgraph_pie3d.php';

 }

 

 function index(){

     

   for($i=0; $i<=3;$i++){

    

    @unlink(PUBPATH.'chart/img'.$i.'.jpg');

    

    // Some data

    $data = array(20,27,45,75,90);

    

    // Create the Pie Graph.

    $graph = new PieGraph(800,450);

    $graph->SetShadow();

    

    // Set A title for the plot

    $graph->title->Set("Pie Graph");

    $graph->title->SetFont(FF_VERDANA,FS_BOLD,18); 

    $graph->title->SetColor("darkblue");

    $graph->legend->Pos(0.1,0.2);

    $graph->legend->Pos(0.9,0.9,'left','bottom');

    $graph->legend->SetLayout(LEGEND_VERT);

    

    // Create pie plot

    $p1 = new PiePlot3d($data);

    $p1->SetTheme("earth");

    $p1->SetCenter(0.4);

    $p1->SetAngle(20);

    $p1->value->SetFont(FF_ARIAL,FS_NORMAL,12);

    $p1->SetLegends(array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct"));

    

    $graph->Add($p1);

    $graph->Stroke(PUBPATH.'chart/img'.$i.'.jpg');

    

   }   

 }



}