wp_check_post_hierarchy_for_loops() WP 3.1.0
Check the given subset of the post hierarchy for hierarchy loops.
Prevents loops from forming and breaks those that it finds. Attached to the 'wp_insert_post_parent' filter.
No Hooks.
Return
Int
. The new post_parent for the post, 0 otherwise.
Usage
wp_check_post_hierarchy_for_loops( $post_parent, $post_ID );
- $post_parent(int) (required)
- ID of the parent for the post we're checking.
- $post_ID(int) (required)
- ID of the post we're checking.
Notes
- See: wp_find_hierarchy_loop()
Changelog
Since 3.1.0 | Introduced. |
Code of wp_check_post_hierarchy_for_loops() wp check post hierarchy for loops WP 5.7
function wp_check_post_hierarchy_for_loops( $post_parent, $post_ID ) {
// Nothing fancy here - bail.
if ( ! $post_parent ) {
return 0;
}
// New post can't cause a loop.
if ( ! $post_ID ) {
return $post_parent;
}
// Can't be its own parent.
if ( $post_parent == $post_ID ) {
return 0;
}
// Now look for larger loops.
$loop = wp_find_hierarchy_loop( 'wp_get_post_parent_id', $post_ID, $post_parent );
if ( ! $loop ) {
return $post_parent; // No loop.
}
// Setting $post_parent to the given value causes a loop.
if ( isset( $loop[ $post_ID ] ) ) {
return 0;
}
// There's a loop, but it doesn't contain $post_ID. Break the loop.
foreach ( array_keys( $loop ) as $loop_member ) {
wp_update_post(
array(
'ID' => $loop_member,
'post_parent' => 0,
)
);
}
return $post_parent;
}