delete_meta_value example

if ( is_wp_error( rest_validate_value_from_schema( $current, $args['schema'] ) ) ) {
                        return new WP_Error(
                            'rest_invalid_stored_value',
                            /* translators: %s: Custom field key. */
                            sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ),
                            array( 'status' => 500 )
                        );
                    }
                }

                $result = $this->delete_meta_value( $object_id, $meta_key, $name );
                if ( is_wp_error( $result ) ) {
                    return $result;
                }
                continue;
            }

            if ( ! $args['single'] && is_array( $value ) && count( array_filter( $value, 'is_null' ) ) ) {
                return new WP_Error(
                    'rest_invalid_stored_value',
                    /* translators: %s: Custom field key. */
                    sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ),