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   Contributed by Codex — 2 years ago

   Example of secondary loop and reset

   <?php
   // example args
   $args = array( 'posts_per_page' => 3 );
   
   // the query
   $the_query = new WP_Query( $args );
   ?>
   
   <?php if ( $the_query->have_posts() ) : ?>
   
   	<!-- start of the secondary loop -->
   	<?php while ( $the_query->have_posts() ) : $the_query->the_post(); ?>
   		<?php the_title(); ?>
   		<?php the_excerpt(); ?>
   	<?php endwhile; ?>
   	<!-- end of the secondary loop -->
   
   	<!-- put pagination functions here -->
   
   	<!-- reset the main query loop -->
   	<?php wp_reset_postdata(); ?>
   
   <?php else:  ?>
   
   	<p><?php _e( 'Sorry, no posts matched your criteria.' ); ?></p>
   
   <?php endif; ?>
   

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   Contributed by Aurovrata Venet — 2 months ago

   WARNING, only reset the post data if the query is successful…

   $query = array(
      //some post query parameters
     );
   $post_results = get_posts($query);
   if(!empty($post_results)){
     //do something with your query results
     //invoke post data reset here
     wp_reset_postdata();
   }
   //if you invoke it after the check and the result did not return any posts, it will reset the post data from a previous query
   wp_reset_postdata(); // WRONG
   

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