How to extract image width from add_image_size?

Question

How can I extract the width of an image as defined in add_image_size for use as a template variable?

For example if my theme defines the size small as add_image_size( 'small', 195, 146, true ); 195 would be the variable.

I am trying to build a dynamic mshots url.

Answer 1

Generally speaking, there's no need to do this. However, if it's one added using add_image_size, it will be in the $_wp_additional_image_sizes global.

global $_wp_additional_image_sizes;
echo $_wp_additional_image_sizes['small']['width'];

Answer 2

This <?php wp_get_attachment_image_src( $attachment_id); ?> should return an array of

[0] => url
[1] => width
[2] => height

Also wp_get_attachment_metadata returns the original image size and additional photo data.