This does not look in exif data of the file. This only compares width and height and adds a landscape class or portrait class depending.
I’m adding a filter hook using my genesis framework. The hook is genesis_get_image. I’m editing the html for the image.
One has to test if $output is FALSE before passing it to simplexml_load_string()
add_filter('genesis_get_image', 'pb_get_image');
function pb_get_image($output){
if ($output) {
$xml = simplexml_load_string($output);
$width = $xml["width"];
$height = $xml["height"];
($xml["class"]) ? $class = $xml["class"] : $class = "";
if (intval($width) >= intval($height)){
$class .= " landscape";
}
else {
$class .= " portrait";
}
$xml["class"] = trim($class);
$output = $xml->asXML();
}
return $output;
}