_rest_array_intersect_key_recursive example

function _rest_array_intersect_key_recursive( $array1, $array2 ) {
    $array1 = array_intersect_key( $array1, $array2 );
    foreach ( $array1 as $key => $value ) {
        if ( is_array( $value ) && is_array( $array2[ $key ] ) ) {
            $array1[ $key ] = _rest_array_intersect_key_recursive( $value, $array2[ $key ] );
        }
    }
    return $array1;
}

/** * Filters the REST API response to include only a white-listed set of response object fields. * * @since 4.8.0 * * @param WP_REST_Response $response Current response being served. * @param WP_REST_Server $server ResponseHandler instance (usually WP_REST_Server). * @param WP_REST_Request $request The request that was used to make current response. * @return WP_REST_Response Response to be served, trimmed down to contain a subset of fields. */