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I need to switch WordPress's post context, sort of like switch_to_blog() but for posts. What's the safest way to alter WordPress's global state and switch it back?

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Use setup_postdata() to change and wp_reset_postdata() to roll back to original.

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Very helpful, thanks Rarst. I don't need to loop through any posts. Just get a single one via get_post( $post_id ). Is this still the way to go given that background? I'm not using have_post(), the_post() and the like, just get_post(). (Googlers, see also: codex.wordpress.org/Class_Reference/…) – editor Jun 29 '11 at 16:57
@editor yep, same principle. The point of setup_postdata() is that it doesn't care about the Loop or more precisely it's one of small standalone cogs in it. – Rarst♦ Jun 29 '11 at 17:36

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