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After run a query

$posts = (array)new WP_Query($args);

I use this data to do some calculation on post meta. I didn't display the posts. Do I still need to use wp_reset_postdata after the query?

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up vote 2 down vote accepted

If you called the_post() on the query, then yes. This resets the global variables used in the main queries.

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Thanks for making this crystal clear! –  Jenny Aug 11 '12 at 4:06
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