Why do I get Fatal error: Call to undefined function get_most_recent_post_of_user()?

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1. get_most_recent_post_of_user() is for multisite installs to get the most recent post of the user from each blog.

   Here is a comparable function you can use that will return the post object of the defined users most recent post.

   function wpse_get_user_recent( $user ) {
       global $wpdb;
   
       $recent  = $wpdb->get_row( $wpdb->prepare("SELECT ID, post_date_gmt FROM {$prefix}posts WHERE post_author = %d AND post_type = 'post' AND post_status = 'publish' ORDER BY post_date_gmt DESC LIMIT 1", (int)$user ), ARRAY_A);
   
           if( ! isset( $recent['ID'] ) )
               return new WP_Error( 'No post found for selected user' );
   
       return get_post( $recent['ID'], 'ARRAY_A' );
   
   }
   

   Usage:

   $post = wpse_get_user_recent( 36 );
   setup_post_data( $post );
   
   the_title();
   the_content();
   wp_reset_postdata();
   

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