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Automatically set/assign parent taxonomy terms for hierarchical taxonomies in WordPress
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<?php | |
add_action( 'set_object_terms', 'auto_set_parent_terms', 9999, 6 ); | |
/** | |
* Automatically set/assign parent taxonomy terms to posts | |
* | |
* This function will automatically set parent taxonomy terms whenever terms are set on a post, | |
* with the option to configure specific post types, and/or taxonomies. | |
* | |
* | |
* @param int $object_id Object ID. | |
* @param array $terms An array of object terms. | |
* @param array $tt_ids An array of term taxonomy IDs. | |
* @param string $taxonomy Taxonomy slug. | |
* @param bool $append Whether to append new terms to the old terms. | |
* @param array $old_tt_ids Old array of term taxonomy IDs. | |
*/ | |
function auto_set_parent_terms( $object_id, $terms, $tt_ids, $taxonomy, $append, $old_tt_ids ) { | |
/** | |
* We only want to move forward if there are taxonomies to set | |
*/ | |
if( empty( $tt_ids ) ) return FALSE; | |
/** | |
* Set specific post types to only set parents on. Set $post_types = FALSE to set parents for ALL post types. | |
*/ | |
$post_types = array( 'posts' ); | |
if( $post_types !== FALSE && ! in_array( get_post_type( $object_id ), $post_types ) ) return FALSE; | |
/** | |
* Set specific post types to only set parents on. Set $post_types = FALSE to set parents for ALL post types. | |
*/ | |
$tax_types = array( 'categories' ); | |
if( $tax_types !== FALSE && ! in_array( get_post_type( $object_id ), $post_types ) ) return FALSE; | |
foreach( $tt_ids as $tt_id ) { | |
$parent = wp_get_term_taxonomy_parent_id( $tt_id, $taxonomy ); | |
if( $parent ) { | |
wp_set_post_terms( $object_id, array($parent), $taxonomy, TRUE ); | |
} | |
} | |
} |
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