Add value to WP Attachment Meta Data

Question

I would like to let Wordpress calculate the aspect ratio & orientation when the media is uploaded instead of doing this in the templates. Then I can call images and ask for image.orientation which will give me 'portrait' or 'landscape' as a value.

Example, how it would look like after uploading an image:

Is this possible or do I have to do this in the frontend?

Answer 1

You can write some code for it. Use http://codex.wordpress.org/Function_Reference/wp_get_attachment_metadata to get the width and the height, and then if $width/$height > 1 => landscape, otherwise its portrait. Store this value in the attachment using: http://codex.wordpress.org/Function_Reference/wp_update_attachment_metadata.

You can use an action for this, such as:

add_action('add_attachment', 'process_images');

Adding the solution as well, following from your code attempt (I HAVENT TESTED THIS):

function attachment_orientation_meta($id){
    $attachmentInfo = wp_get_attachment_metadata($id);
    $attachmentOrientation = ( $attachmentInfo['height'] > $attachmentInfo['width'] ) ? 'portrait' : 'landscape';
    update_post_meta($id, 'orientation', $attachmentOrientation);
}
add_action( 'add_attachment', 'attachment_orientation_meta' );