How to calculate rows in query PHP MySQL?

Problem :

I have to 2 rows of query of sum_hour(double type) in database

1st row = sum_hour = 2.75

2nd row = sum_hour = 3.00

It belongs inside 2(two) groups which is type_move = 'P' and (start date >= 2016-11-11 AND end_date <= 2016-11-15) group. The code as below :

    $sql    = "SELECT  sum_hour,
                    FROM table
                    WHERE type_move = 'P' AND user_id='username' AND (start_date >= '2016-11-11' AND end_date <= '2016-11-15')
                    GROUP BY sum_hour ";

    $result = mysqli_query($connect, $sql);
    if($result && mysqli_num_rows($result) > 0)
        while($row = mysqli_fetch_assoc($result))
            $hour = $row['sum_hour'];
            echo " Hours = " .$hour. "<br/>";

        echo "Total hours = " .$hour. "<br/>";

        echo mysqli_error($connect);

And the output as below :

Hours = 2.75

Hours = 3.00

Total hours = ?

My question is , how to calculate 2 rows (Hours) above ? I tried to run sql statement in phpmyadmin. It work and i can see the value sum up into = 5.75 but i don't know how to echo the total in browser


Solution :

Just update your loop with this:

$totalHours = 0;

while($row = mysqli_fetch_assoc($result))
        $hour = $row['sum_hour'];

        $totalHours += $hour;

        echo " Hours = " .$hour. "<br/>";

echo "Total hours = " .$totalHours. "<br/>";

You need to store the first value in a variable then add the second one to the first value. Just make sure that the value can be read outside the loop.

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