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    copied!<p>These functions allow you to set the depth you want to use to determine the next page. So in the question, the user was on '3-series', so the depth would be 2. So, the link returned would be to the "Audi" page. </p> <p>It's used like this in your template (my example is using an image for the link text):</p> <pre><code>$nextIMG = '&lt;img src="'.get_template_directory_uri().'/images/icon-nav-right.png"/&gt;'; echo next_project_link($nextIMG); </code></pre> <p>And place this in functions.php:</p> <pre><code> /* * Next Project Link */ function next_project_link($html) { global $post; // Change this to set what depth you want the next page of $parent_depth = 2; $ancestors = get_post_ancestors($post); $current_project_id = $ancestors[$parent_depth-1]; // Check for cached $pages $pages = get_transient( 'all_pages' ); if ( empty( $transient ) ){ $args = array( 'post_type' =&gt; 'page', 'order' =&gt; 'ASC', 'orderby' =&gt; 'menu_order', 'post_parent' =&gt; $ancestors[$parent_depth], 'fields' =&gt; 'ids', 'posts_per_page' =&gt; -1 ); $pages = get_posts($args); set_transient('all_pages', $pages, 10 ); } $current_key = array_search($current_project_id, $pages); $next_page_id = $pages[$current_key+1]; if( isset($next_page_id) ) { // Next page exists return '&lt;a class="next-project" href="'.get_permalink($next_page_id).'"&gt;'.$html.'&lt;/a&gt;'; } } /* * Previous Project Link */ function previous_project_link($html) { global $post; // Change this to set what depth you want the next page of $parent_depth = 2; $ancestors = get_post_ancestors($post); $current_project_id = $ancestors[$parent_depth-1]; // Check for cached $pages $pages = get_transient( 'all_pages' ); if ( empty( $transient ) ){ $args = array( 'post_type' =&gt; 'page', 'order' =&gt; 'ASC', 'orderby' =&gt; 'menu_order', 'post_parent' =&gt; $ancestors[$parent_depth], 'fields' =&gt; 'ids', 'posts_per_page' =&gt; -1 ); $pages = get_posts($args); set_transient('all_pages', $pages, 10 ); } $current_key = array_search($current_project_id, $pages); $prev_page_id = $pages[$current_key-1]; if( isset($prev_page_id) ) { // Previous page exists return '&lt;a class="previous-project" href="'.get_permalink($prev_page_id).'"&gt;'.$html.'&lt;/a&gt;'; } } </code></pre>
 

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