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Is there a filter for when a Featured Image is set/unset or changed.

I need to delete transient data when the above occurs.

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The post featured image ID is stored as post metadata, so I would recommend hooking into the update_post_meta or update_post_metadata hooks, and then query the post meta for '_thumbnail_id' being set.

See this related answer from Jan Fabry.

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Thanks Chip that worked perfectly. – Colin Murphy May 10 '12 at 15:47

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