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wp_check_post_hierarchy_for_loops › WordPress Function
Since3.1.0
Deprecatedn/a
› wp_check_post_hierarchy_for_loops ( $post_parent, $post_id )
Parameters: (2) |
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See: | |
Returns: |
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Defined at: |
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Codex: |
Checks the given subset of the post hierarchy for hierarchy loops.
Prevents loops from forming and breaks those that it finds. Attached to the {@see 'wp_insert_post_parent'} filter.Source
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;
}