protected function implode_values( $values ) {
		$values_to_implode = array();

		foreach ( $values as $value ) {
			$value               = (string) is_scalar( $value ) ? $value : '';
			$values_to_implode[] = str_replace( ',', '\\,', $value );
		}

		return implode( ', ', $values_to_implode );
	}