How to get default image sizes attribute

If you want to get those set in the admin panel, use the function get_option. The keys are

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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