The Options API in WordPress is one of the many WordPress APIs we all use every day when developing with WordPress. A quick call to get_option() is not an uncommon sight. What if you could dynamically filter those options? You can.
Adding filters in WordPress is also a common practice. Combining this with the Options API can allow for, for example, the ability to change an option when in preview mode without committing to the change.
In the “Magazine” template in Canvas by WooThemes, for example, WooTumblog “image” and “video” posts are aware when they are present in the magazine-style grid. This is an example of filtering the Options API.