Description:
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Neither imageantialias and imagesetthickness seem to work reliably.

The included code produces a significantly different image than one would expect.

Reproduce code:
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<?php

        $im = imagecreatetruecolor(500,500);

        $col0 = imagecolorallocate($im,153,204,153);
        $col1 = imagecolorallocate($im,118,153,118);

        imagefilledrectangle($im,0,0,499,499,$col0);

        imageantialias($im,TRUE);
        imagesetthickness($im,5);

        imagepolygon($im,array(100,100,100,400,400,400,400,100),4,$col1);
        imagerectangle($im,150,150,350,350,$col1);
        imageline($im,200,200,200,300,$col1);
        imageline($im,200,300,300,300,$col1);
        imageline($im,300,300,300,200,$col1);
        imageline($im,300,200,200,200,$col1);
        imageellipse($im,250,250,400,400,$col1);

        header("Content-type: image/png");
        imagepng($im);

?>


Expected result:
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This code should generate four figures on a 500 x 500 image. Each figure should be centered on the image.

Figure 1: Small square drawn via imageline
Figure 2: Medium square drawn via imagerectangle
Figure 3: Large square drawn via imagepolygon
Figure 4: Large circle drawn via imageellipse

All figures should be drawn with a 5 pixel thick line.
All figures should be antialiased.

Actual result:
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As listed, the code generates a properly sized image, but none of the figures are antialiased and only the medium square is set to the proper thickness. All the other figures are drawn with a 1 pixel thick line.

This image is available at:
http://www.demark.org/phpgdbug/image.png

If I comment out the imageantialias line, no figures are antialiases (as expected), but only the squares are drawn with the proper thickness. Once again, the circle is drawn with a 1 pixel thick line.

This image is available at:
http://www.demark.org/phpgdbug/image-noaa.png