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wp_check_term_hierarchy_for_loops ›

Since3.1.0
Deprecatedn/a
wp_check_term_hierarchy_for_loops ( $parent, $term_id, $taxonomy )
Parameters: (3)
  • (int) $parent `term_id` of the parent for the term we're checking.
    Required: Yes
  • (int) $term_id The term we're checking.
    Required: Yes
  • (string) $taxonomy The taxonomy of the term we're checking.
    Required: Yes
Returns:
  • (int) The new parent for the term.
Defined at:
Codex:

Checks the given subset of the term hierarchy for hierarchy loops.

Prevents loops from forming and breaks those that it finds.

Attached to the {@see 'wp_update_term_parent'} filter.



Source

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;
}