wp_check_term_hierarchy_for_loops( int $parent, int $term_id, string $taxonomy )
Checks the given subset of the term hierarchy for hierarchy loops.
Description
Prevents loops from forming and breaks those that it finds.
Attached to the ‘wp_update_term_parent’ filter.
Parameters
- $parent
-
(Required)
term_idof the parent for the term we're checking. - $term_id
-
(Required) The term we're checking.
- $taxonomy
-
(Required) The taxonomy of the term we're checking.
Return
(int) The new parent for the term.
Source
File: wp-includes/taxonomy.php
function wp_check_term_hierarchy_for_loops( $parent, $term_id, $taxonomy ) {
// Nothing fancy here - bail
if ( !$parent )
return 0;
// Can't be its own parent.
if ( $parent == $term_id )
return 0;
// Now look for larger loops.
if ( !$loop = wp_find_hierarchy_loop( 'wp_get_term_taxonomy_parent_id', $term_id, $parent, array( $taxonomy ) ) )
return $parent; // No loop
// Setting $parent to the given value causes a loop.
if ( isset( $loop[$term_id] ) )
return 0;
// There's a loop, but it doesn't contain $term_id. Break the loop.
foreach ( array_keys( $loop ) as $loop_member )
wp_update_term( $loop_member, $taxonomy, array( 'parent' => 0 ) );
return $parent;
}
Changelog
| Version | Description |
|---|---|
| WP-3.1.0 | Introduced. |