How to smooth a drawable arc (drawn with GD library) in php?

Question

PHP

Hello. There is a need to draw an arc using php (the output should look like a filling graph). It's quite possible to draw, but the arc "ripples", as I understand it, there is no anti-aliasing. How to smooth? The drawing method is of course a crutch, but I don’t see another way to make the arc wider.

for ($i = 0; $i < 90; $i++){
  imageArc($img, 860, 1292, 1400 - $i, 1400 - $i, -90, 180, $color);
}

imageantialias() from the same library doesn't help.

Answer 1

Where is the code?
Maybe the resolution needs to be done more, and not "smooth"?
This is not 3d graphics, there is no such processing.