Created
July 24, 2015 15:59
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Testing if a post is in a descendant category
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| <?php | |
| /** | |
| * Tests if any of a post's assigned categories are descendants of target categories | |
| * | |
| * @param int|array $cats The target categories. Integer ID or array of integer IDs | |
| * @param int|object $_post The post. Omit to test the current post in the Loop or main query | |
| * @return bool True if at least 1 of the post's categories is a descendant of any of the target categories | |
| * @see get_term_by() You can get a category by name or slug, then pass ID to this function | |
| * @uses get_term_children() Passes $cats | |
| * @uses in_category() Passes $_post (can be empty) | |
| * @version 2.7 | |
| * @link http://codex.wordpress.org/Function_Reference/in_category#Testing_if_a_post_is_in_a_descendant_category | |
| */ | |
| if ( ! function_exists( 'post_is_in_descendant_category' ) ) { | |
| function post_is_in_descendant_category( $cats, $_post = null ) { | |
| foreach ( (array) $cats as $cat ) { | |
| // get_term_children() accepts integer ID only | |
| $descendants = get_term_children( (int) $cat, 'category' ); | |
| if ( $descendants && in_category( $descendants, $_post ) ) | |
| return true; | |
| } | |
| return false; | |
| } | |
| } | |
| ?> |
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Just found this very cool snippet on WordPress Codex http://codex.wordpress.org/Function_Reference/in_category#Testing_if_a_post_is_in_a_descendant_category.