Description:
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When the arc size is specified as an ODD number of pixels, the arc angles are calculated incorrectly.

When specified as an EVEN number of pixels, it works OK.

See https://imgur.com/a/QCdscXj

The problem seems to be a combination of PHP version and GD version.

Fails: Ubuntu 18.04
PHP:7.2.24-0ubuntu0.18.04.6
GD: 2.2.5

Works: Redhat 7
PHP: 7.1.33
GD: 2.3


Test script:
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<?php
$image_size = 400;
$arc_size   = $_GET['r'] ?? 275;

$image = imagecreate($image_size, $image_size);

$c1 = imagecolorallocate($image, 255, 255, 255);
$c2 = imagecolorallocate($image, 0, 255, 0);
$c3 = imagecolorallocate($image, 0, 0, 255);

imagefilledrectangle($image, 0, 0, $image_size, $image_size, $c1);

imagefilledarc($image, $image_size/2, $image_size/2, $arc_size, $arc_size, 135, 270, $c3, IMG_ARC_PIE);
imagefilledarc($image, $image_size/2, $image_size/2, $arc_size, $arc_size, 270, 405, $c2, IMG_ARC_PIE);

header('Content-type: image/png');
imagepng($image);
imagedestroy($image);