$host = "localhost";
    $username = "root";
    $password = "rootacc";

    $database = "inrestaurant";

    $restDat = "restaurant_data";
    $userDat = "user_data";
    $staffDat = "staff_data";

    function GET_DATA($tableName, $isAdmin, $data = null)
    {
        global $dbConn;

        if(!$dbConn)
        {
            //Invalid Connection
            echo "Unable to establish a connection to host\n\n".mysqli_connect_errno().PHPEOL."<br>";
        }
        else
        {
            //Valid Connection
            if($tableName == "restaurant_data" && $data == null)
                GET_RESTDAT($dbConn, $isAdmin);
            else if ($tableName == "staff_data"&& $data == null)
                GET_STAFFDAT($dbConn);
            else if ($isAdmin && ($tableName == "restaurant_data" || $tableName == "staff_data") && $data != null)
                GET_DAT_SINGLE($dbConn, $tableName, $data);
        }
    }

    function GET_DAT_SINGLE($dbConn, $tableName, $data)
    {
        if($tableName == "staff_data")
        {
            $columnNames = "staffID, staffName, staffContactNo, staffEmail";
            $condition = "staffID = '".$data;
        }
        else if($tableName == "restaurant_data")
        {
            $columnNames = "restaurantID, restaurantName, restaurantType, restaurantLot, restaurantOwn, restaurantContactNo, restaurantEmail";
            $condition = "restaurantID = '".$data;
        }

        $query = "SELECT ".$columnNames." FROM ".$tableName." WHERE ".$condition."'";
        $result = mysqli_query($dbConn, $query);

        if($result)
        {
            if(mysqli_num_rows($result) != 0 )
            {
                $row = mysqli_fetch_assoc($result);
                echo json_encode($row);
            }
            else
            {
                echo "Failed to retrieve a valid data";
            }
        }
        else
        {
            echo "Invalid Input";
        }
    }