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Get parent name from post->ID and display list of child pages from that.

/ Published in: PHP
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Use getTopParentPostName() to get the parent slug. Then use get_ID_by_slug() to get the ID of it. The use wp_list_pages() to display the child pages :)

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  1. <?php
  2.  
  3. // get parent ID
  4. function getTopParentPostName($myid)
  5. {
  6. 	$mypage = get_page($myid);
  7.  
  8. 	if ($mypage->post_parent == 0)
  9. 	{
  10. 		return $mypage->post_name;
  11. 	}
  12. 	else
  13. 	{
  14. 	        return getTopParentPostName($mypage->post_parent);
  15. 	}
  16. }
  17.  
  18. // get ID of parent from slug
  19. function get_ID_by_slug($page_slug) {
  20. 	$page = get_page_by_path($page_slug);
  21. 	if ($page) {
  22. 		return $page->ID;
  23. 	} else {
  24. 		return null;
  25. 	}
  26. }
  27.  
  28. $args = array(
  29. 		'echo'         => 1,
  30. 		'title_li'     => '',
  31. 		'child_of'     => get_ID_by_slug(getTopParentPostName($post->ID)),
  32. 		'sort_column'  => 'menu_order, post_title'); 
  33.  
  34. ?>
  35. <?=wp_list_pages( $args );?>

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