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<?php
$origimage = "pic.jpg";
$logoimage = "logo.gif";
$newimage = "newpic.jpg";
$origsize = getimagesize($origimage);
$logosize = getimagesize($logoimage);
$logo_im = imagecreatefromgif($logoimage);
$orig_im = imagecreatefromjpeg($origimage);
imagecopy($orig_im, $logo_im, $origsize[0] - $logosize[0], $origsize[1] - $logosize[1], 0, 0, $logosize[0], $logosize[1]);
imagejpeg($orig_im, $newimage);
?>