If you want to get those set in the admin panel, use the function get_option. The keys are
1 2 3 4 5 6 | get_option('thumbnail_size_w'); get_option('thumbnail_size_h'); get_option('medium_size_w'); get_option('medium_size_h'); get_option('large_size_w'); get_option('large_size_h'); |
If you want them for some specific attachment, use wp_get_attachment_image_src.
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