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<?php 
global $post, $wp_query;

?>
    <?php   //If top level, find children

            $children = new WP_Query(array(
                'post_type'=>'destination',
                'post_parent'=>0,
                'posts_per_page' => -1,
                'order' => DESC
            ));

            if($children->have_posts()): ?>
                <ul>
                <?php while ( $children->have_posts() ) : $children->the_post(); ?>
                <?php  
					$active_id = get_queried_object();
					$active_id = $active_id->ID;
					$active_parent_id = $active_id->post_parent;
				?>
                    <li class="<?php if( $post->ID == $active_id ){ echo 'active'; } ?>"><a href="<?php the_permalink(); ?>"> <?php echo the_title();?> </a>
                    
                    	<?php 
						$current_id = get_queried_object();
						//print_r($current_id);
						$cur_id = $current_id->ID;
						$parent_id = $current_id->post_parent;
						
							if($post->ID == $cur_id){
							
								$cu_childrens = get_children( 'post_parent='.$cur_id.'&post_type=destination');
								
								if ( $cu_childrens ) {
									echo '<ul>';
									foreach ( $cu_childrens as $cu_children ) {
										$permalink = get_permalink( $cu_children->ID );
										echo '<li><a href="'.$permalink.'">'.$cu_children->post_title.'</a></li>';
									}
									echo '</ul>';
								}
								
							}
							
							if( $current_id->post_parent != 0 && $post->ID == $parent_id ){
								$cu_childrens = get_children( 'post_parent='.$parent_id.'&post_type=destination');
								//print_r($cu_childrens);
								if ( $cu_childrens ) {
									echo '<ul>';
									foreach ( $cu_childrens as $cu_children ) {
										$permalink = get_permalink( $cu_children->ID );
										?><li class="<?php if($cur_id == $cu_children->ID ){echo 'active'; }?>"><a href="<?php echo $permalink ?>"><?php echo $cu_children->post_title; ?></a></li>
									<?php }
									echo '</ul>';
								}
								
							}
							
						?>
                    </li>
                <?php endwhile; ?>
                </ul>
            <?php endif; ?>

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