$width=410;
$height=410;
Header("Content-type: image/gif");
$im = imagecreate($width,$height);
$gray=ImageColorAllocate($im,225,225,225);
$black=ImageColorAllocate($im,0,0,0);
for ($i=0;$i<=200;$i+=10)
{
imageline($im,210-$i,200,210,$i,$black);
imageline($im,210+$i,200,210,$i,$black);
imageline($im,210,210+$i,$i,200,$black);
imageline($im,210,410-$i,210+$i,200,$black);
}
imagePng($im);
ImageDestroy($im);
?>