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
$parent_termintrequiredterm_idof the parent for the term we’re checking.$term_idintrequired- The term we’re checking.
$taxonomystringrequired- The taxonomy of the term we’re checking.
Source
function wp_check_term_hierarchy_for_loops( $parent_term, $term_id, $taxonomy ) {
// Nothing fancy here - bail.
if ( ! $parent_term ) {
return 0;
}
// Can't be its own parent.
if ( $parent_term === $term_id ) {
return 0;
}
// Now look for larger loops.
$loop = wp_find_hierarchy_loop( 'wp_get_term_taxonomy_parent_id', $term_id, $parent_term, array( $taxonomy ) );
if ( ! $loop ) {
return $parent_term; // No loop.
}
// Setting $parent_term 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_term;
}
Changelog
| Version | Description |
|---|---|
| 3.1.0 | Introduced. |
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