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WordPress: in subcatory?

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Usually use in a template with `in_category()`, like `if ( in_category( 3 ) || in_subcategory( 3 ) ) { ...`. Tested in WP 2.8.4.

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  1. function in_subcategory( $cat_id ) {
  2. 	$subcats = get_term_children( $cat_id, 'category' );
  3. 	if ( $subcats && !is_wp_error( $subcats ) ) {
  4. 		foreach( $subcats as $child_category ) {
  5. 			if( in_category($child_category) ) {
  6. 				return true;
  7. 			}
  8. 		}
  9. 	}
  10. 	return false;
  11. }

URL: http://codex.wordpress.org/Function_Reference/get_term_children

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