Description:
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Wrong draws filled arcs.

Test script:
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<?php

$image = imagecreatetruecolor(500, 500);

$white    = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$navy     = imagecolorallocate($image, 0x00, 0x00, 0x80);
$red      = imagecolorallocate($image, 0xFF, 0x00, 0x00);

 imagefilledarc($image, 250, 250, 500, 250, 0, 88, $white, IMG_ARC_PIE);
 imagefilledarc($image, 250, 250, 500, 250, 88, 91 , $navy, IMG_ARC_PIE);
 imagefilledarc($image, 250, 250, 500, 250, 91, 360 , $red, IMG_ARC_PIE);

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

?>

Expected result:
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https://www.dropbox.com/s/s1pby0zutsajbed/Pie1.png?dl=0

Actual result:
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https://www.dropbox.com/s/68l645wakutl3n0/Pie2.png?dl=0