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WordPress is_child_of: Is this a child of page x?

/ Published in: PHP
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This makes template code that applies to children of a particular page much more readable, especially if you can use a page path instead of an ID: `if ( is_child_of( 'topic/subtopic' ) ) :`.

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  1. function is_child_of( $page_id, $potential_child_id = '' ) {
  2.  
  3. 	$is_child = false;
  4.  
  5. 	if ( ! is_int( $page_id ) ) {
  6. 		$page = get_page_by_path( $page_id );
  7. 		$page_id = empty( $page ) ? 0 : $page->ID;
  8. 	}
  9.  
  10. 	if ( empty( $potential_child_id ) ) { 
  11. 		$potential_child_id = get_the_ID();
  12. 	}
  13.  
  14. 	$potential_child = get_page( $potential_child_id );
  15.  
  16. 	if ( ! empty( $potential_child ) && is_array( $potential_child->ancestors ) ) {
  17. 		$is_child = in_array( $page_id, $potential_child->ancestors );
  18. 	}
  19.  
  20. 	return $is_child;
  21. }

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