Description:
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I use the imagerotate() function in my photo gallery to rotate 
the images (if there is no support for "convert"). What I find out 
is, that after rotating ALL EXIF data is lost. I guess this is not 
the desired behavior ;-)  

Reproduce code:
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$img2rotate="some_image.jpg";
$image=imagecreatefromjpeg("$img2rotate");
$rotated_img=imagerotate($image, 90, 0);
imagejpeg($rotated_img, "$img2rotate", 100);

Expected result:
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I expect to keep the EXIF data from the original image... 

Actual result:
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ALL EXIF data is lost.