$stmt = $db->prepare($sql_val);
		$stmt->bindParam(':total_value', $total_value, PDO::PARAM_STR);
	 	$stmt->execute();
	 	$totalv = $stmt->fetchAll(\PDO::FETCH_GROUP|\PDO::FETCH_ASSOC);

   	$sumv = array_sum(array_column($totalv, 'total_value'));

my var_dump = 0 <-- bad