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There's no mention of custom fields values in Get_post's codex page. Is it impossible to use get_post to get a custom field value of some post, and if so, is it necessary to perform a whole loop just for that?

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All of the custom field functions accept the post id as a parameter. You can use all those functions directly without the need to actually retrieve the post itself.

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    Also, when fetching with get_posts, WP_Query, etc, all meta fields and taxonomies are usually prefetched and cached, so each call to get_post_meta will be server from cache rather than hitting the db. – kovshenin Mar 13 '13 at 20:00

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