Wordpress transients

transient-article-list.php

        <div class="nav__articles">
          <?php
            // If the transient doesn't exist, do the query
            $links = '';
            if ( FALSE === ( $links = get_transient( '_menu_article_display_list' ) ) ) :
              $args = array(
                'order'      => 'DESC',
                'post_type'  => 'post',
                'show_posts' => 10,
                'fields'     => 'ids',
              );
              $ids = get_posts( $args );
              if ( $ids ) {
                foreach ( $ids as $id ) {
                  $links .= '<li><span class="nav__article--date">' . get_the_time( 'd F', $id ) . '</span><strong class="nav__article--name">' . get_the_title( $id ) . '</strong><a class="nav__article--more" href="' . get_permalink( $id ) .'">' . __( 'Read article', 'drivdigital' ) . '</a></li>';
                }
              }
              set_transient( '_menu_article_display_list' , $links, 12 * HOUR_IN_SECONDS  );
            endif;
            echo '<ul class="nav__articles--list">' . $links . '</ul>';
           ?>
        </div>

transient-child-pages.php

       <?php
          // I love setting queries in 'set_transient' and 'get_transient'.
          // It basically saves the results from the query in the database
          // so it doesn't have to do the query on every page load. It does it
          // once, then just shows the cached results. 
          $links = '';
          $id = get_the_ID(); // Might need get_page_object_id();
          if ( FALSE === ( $links = get_transient( '_child_menu_transient_' . $id ) ) ) :
            $args = array(
              'child_of'        => $id, // get all children of this post
              'parent'          => $id, // Make sure the parent is this post
              'fields'          => 'ids', // Only get IDs from this query. We don't need titles or meta or anything else
              'post_type'       => 'page', // only show pages, not posts
              'posts_per_page'  => -1, // show all results
              'post_status'     => 'publish', // only published results, not private
              'orderby'         => 'menu_order', // however they are in the admin is how they list here.
              'order'           => 'ASC' // Like jesus.
            );
            $children = get_pages( $args ); // get_pages based on this parent and children

            if( $children ){
                $has_children = TRUE;
                foreach( $children as $child ) {
                  $links .= '<li class="lined-grey"><a href="' . get_permalink( $child ) . '" class="p pud text-grey"><span class="arrow-right arrow-red"></span>' . get_the_title( $child ) . '</a></li>';
                }
            }
          set_transient( '_child_menu_transient_' . $id, $links, 12 * HOUR_IN_SECONDS  );
          endif;
          echo '<ul class="menu-vertical">' . $links . '</ul>';
       ?>