"3", "1" => "7", "2" => "1", "3" => "9", "4" => "0", "5" => "5", "6" => "2", "7" => "6", "8" => "4", "9" => "8" ); // Convert the map to a JSON string with JSON_FORCE_OBJECT option $jsonString = json_encode($cn, JSON_FORCE_OBJECT); // Send the JSON string to the Flutter app echo $jsonString; ?>