function resize_image($filename, $tmpname, $xmax, $ymax) {
$ext = explode(".", $filename);
$ext = $ext[count($ext)-1];
if($ext == "jpg" || $ext == "jpeg") $im = imagecreatefromjpeg($tmpname);
elseif($ext == "png") $im = imagecreatefrompng($tmpname);
elseif($ext == "gif") $im = imagecreatefromgif($tmpname);
$x = imagesx($im);
$y = imagesy($im);
if($x <= $xmax && $y <= $ymax) return $im;
if($x >= $y) {
$newx = $xmax;
$newy = $newx * $y / $x;
} else {
$newy = $ymax; $newx = $x / $y * $newy;
}
$im2 = imagecreatetruecolor($newx, $newy);
imagecopyresized($im2, $im, 0, 0, 0, 0,
floor($newx), floor($newy), $x, $y);
return $im2;
}
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