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I use the code below, added to a template, to display random posts.

<ul>
<?php $posts = get_posts('orderby=rand&numberposts=5'); foreach($posts as $post) { ?>
<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
<?php } ?>
</ul>

Do I need to reset, presumably by changing

<?php } ?>

to

<?php } wp_reset_postdata(); ?>

And does the need to reset depend on whether this code-block is before or after other loops/queries in the template?

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wp_reset_postdata()

wp_reset_postdata() will restores the global $post variable to the current post in the main query. This is useful when using WP_Query to customize loops or create multiple loops on the same page.

This Answer will solve all your queries about wp_reset_postdata() & WP_Query & get_posts

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  • Accept the answer if it helped you. – JItendra Rana May 19 '17 at 4:25

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