Description:
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As reported by user note #84416, imageelipse() function example #1 defines background, but doesn't use it anywhere.  As a result, changing this color will not change the background.

Reproduce code:
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<?php

// create a blank image
$image = imagecreatetruecolor(400, 300);

// fill the background color
$bg = imagecolorallocate($image, 0, 0, 0);

// choose a color for the ellipse
$col_ellipse = imagecolorallocate($image, 255, 255, 255);

// Should include the following line, but doesn't.
// imagefill($image, 0, 0, $bg);

// draw the ellipse
imageellipse($image, 200, 150, 300, 200, $col_ellipse);

// output the picture
header("Content-type: image/png");
imagepng($image);

?>