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Adding is_tree functon to WordPress

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Add this to functions.php to enable the page-child function is_tree

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  1. function is_tree($pid) {      // $pid = The ID of the page we're looking for pages underneath
  2. 	global $post;         // load details about this page
  3. 	if(is_page()&&($post->post_parent==$pid||is_page($pid))) 
  4.                return true;   // we're at the page or at a sub page
  5. 	else 
  6.                return false;  // we're elsewhere
  7. };

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