On Sun, 2008-04-20 at 15:52 +0200, rb wrote:
> I'm getting from an external source a PNG image in raw format (encoded in
> base64).
>
> And with this code I'll echo on the screen.
>
> ------
> $img=base64_decode($_POST['img']);
>
> header("Content-type: image/png");
> echo $img;
> ------

A quick way would be to try and make an image with the GD library.
Something like:
if (imagecreatefromstring($img)) {
header("Content-type:image/png");
echo $img;
}