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I'm using the Widget Logic plugin to show widgets on certain pages using Wordpress Conditional Tags (or any general PHP code).

What I would like to do is only show a widget on child pages, not top level pages. I tried both of the following but they both return true on all pages (so the widget shows on all pages):

global $post; return ($post->post_parent != 0);

and

global $post; return ( is_page() && $post->post_parent );

Note I tried this for testing and the widget displays on page ID 61 and its children, not just on its children as I was expecting:

global $post; return ($post->post_parent=="61");

Any tips?

Thanks!

  • how about return ($GLOBALS['post']->post_parent != 0); ? – onetrickpony Jul 1 '13 at 19:07
  • I'm not sure you can use PHP like you are trying to with Widget Logic. I have used the plugin many times but never tried raw PHP. According to the Codex it should be is_page() && $post->post_parent but you may be constrained to the conditional tags. – Brooke. Jul 1 '13 at 19:08
  • Thanks guys but neither of those worked. One Trick Pony, the widget still shows on both parent and child. BandonRandon, it shows on neither. – Caroline Elisa Jul 2 '13 at 18:38
  • Your syntax is correct and works as expected with widget logic. global $post; return ( is_page() && $post->post_parent ); Double check that your pages are exclusively parent or child pages as you are expecting. – iyrin Jul 2 '13 at 23:01
  • Perhaps you have the eval function blacklisted (that plugin relies on this naughty function) – onetrickpony Jul 5 '13 at 0:47
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You can find the answer on the plugin's page at wordpress.org. Select the tab 'Other Notes'. You will find it at the example list:

global $post;

// WP page that is a child of page 77
return in_array(77, get_post_ancestors($post)); 

Edit: As an alternative to your suggestions you may try

global $post;
return !empty(get_post_ancestors($post)); 

This is an expensive call and should better be used for testing only. But I suspect that there might be something wrong with your page hierarchy. Is it possible that your top level page is not on root level?

  • Thanks jot but that doesn't work for me. Firstly, it still shows on both parent and child. Secondly, I really want a solution that does not have to have the parent page ID hardcoded, instead shows on any child page. – Caroline Elisa Jul 2 '13 at 18:43
  • Thanks for editing your answer jot! But the second option gives me a PHP error: PHP Fatal error: Can't use function return value in write context in ~\widget_logic.php(284) : eval()'d code on line 1 – Caroline Elisa Jul 23 '13 at 22:00
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Apologies, turns out it was a problem with my theme - using get_posts to list child pages outside the loop without wp_reset_postdata. So a global $post; conflict I guess.

global $post; return ($post->post_parent != 0); works fine.

  • Can you explain what the theme was doing to cause the problem? – s_ha_dum Jul 23 '13 at 22:26
  • Sure! It was using get_posts to list child pages outside the loop without wp_reset_postdata. So a global $post; conflict I guess. – Caroline Elisa Jul 24 '13 at 14:11
  • Edit that into the answer, please. These aren't discussion forums. The answer itself should have all of the relevant information. – s_ha_dum Jul 24 '13 at 14:16

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