Wordpress Attachment display settings

Once we’ve defined the above image sizes (regular, medium and large) — and since by default WordPress doesn’t do it for us

— we’ll add the ability to select our those image sizes from the Attachment Display Settings interface.

It would be nice if you could, when writing a post, insert the desired size image by selecting it from the dropdown as you

normally would for the WordPress default sizes.

To do this, we add the following to our functions.php:

// show custom image sizes on when inserting media
function cake_show_image_sizes($sizes) {
    $sizes['regular'] = __( 'Our Regular Size', 'cake' );
    $sizes['medium'] = __( 'Our Medium Size', 'cake' );
    $sizes['large'] = __( 'Our Large Size', 'cake' );
    return $sizes;
}
add_filter('image_size_names_choose', 'cake_show_image_sizes');

With that in place, we can select our image sizes.