$size = getimagesize ($uri, $info);
$width = $size[0];
$height = $size[1];
if ( is_array($info) && isset($info["APP13"]) ) {
    $iptc = iptcparse($info["APP13"]);
    if ( isset($iptc['2#120'][0]) ) $caption = $iptc['2#120'][0];
}