function imagelinethick($image, $x1, $y1, $x2, $y2, $color, $thick = 1) {
    if ($thick == 1) {
        return imageline($image, $x1, $y1, $x2, $y2, $color);
         }
    $t = $thick / 2 - 0.5;
    if ($x1 == $x2 || $y1 == $y2) {
        return imagefilledrectangle($image,
               round(min($x1, $x2) - $t),
               round(min($y1, $y2) - $t),
               round(max($x1, $x2) + $t),
               round(max($y1, $y2) + $t), $color);
         }
    $k = ($y2 - $y1) / ($x2 - $x1); //y = kx + q
    $a = $t / sqrt(1 + pow($k, 2));
    $points = array(
        round($x1 - (1+$k)*$a), round($y1 + (1-$k)*$a),
        round($x1 - (1-$k)*$a), round($y1 - (1+$k)*$a),
        round($x2 + (1+$k)*$a), round($y2 - (1-$k)*$a),
        round($x2 + (1-$k)*$a), round($y2 + (1+$k)*$a),
        );
    imagefilledpolygon($image, $points, 4, $color);
    return imagepolygon($image, $points, 4, $color);
    }

header ("Content-type: image/png");
$img = imagecreatetruecolor(320, 240);
$ink = imagecolorallocate($img, 255, 255, 255);
imagelinethick($img,10,10,320-11,240-11,$ink,2);
imagelinethick($img,10,240-10,320-11,240-(240-11),$ink,10);
imagepng($img);
imagedestroy($img);