membuat pie dengan php

<?
header("Content-type:image/png");
$image = imagecreate(500,400);
imagecolorallocate($image,0,255,255);
$ungu = imagecolorallocate($image,128,0,128);
$biru = imagecolorallocate($image,0,0,255);
$merah = imagecolorallocate($image,255,0,0);
$hijau = imagecolorallocate($image,0,255,0);
imagefilledarc($image,350,170,200,200,270,360,$biru,IMG_ARC_PIE);
imagefilledarc($image,350,170,200,200,180,270,$merah,IMG_ARC_PIE);
imagefilledarc($image,350,170,200,200,90,180,$ungu,IMG_ARC_PIE);
imagefilledarc($image,350,170,200,200,0,90,$hijau,IMG_ARC_PIE);
imagepng($image);
?>