来自PHP的JSON数组响应的总和

Question

I am retrieving JSON data in array and I sort them into the HTML table. So far it is OK, but I would like to sum the specific values from JSON Response and print the sum of object values.

I have a PHP code which sorting me the data from JSON as following:

foreach($result->response as $value)
 {

  echo "<tr>";
    echo "<td>" . $value->datetime  . "</td>";
    echo "<td>" . $value->service_type  . "</td>";
    echo "<td>" . $value->destination  . "</td>";
    echo "<td>" . $value->duration  . "</td>";
    echo "<td>" . $value->price  . "</td>";
    echo "</tr>";

 }

I am interested only in values of prices (in JSON Array), I would like to take only the value of prices from JSON and sum the values of prices and give the result number under the table.

I am trying this without any success:

$countprice = $result->response->price;
$totalprice = count($countprice);
echo $totalprice; 

The result is weird number, I know that PHP use "count", but I am not sure how to use it. Sorry I am novice in JSON and PHP and I will thank you for any tip you may give me.

Answer 1

Try this

    <?php

    $sum = 0;
    foreach ($result->response as $value) {
    echo "<tr>";
    echo "<td>" . $value->datetime  . "</td>";
    echo "<td>" . $value->service_type  . "</td>";
    echo "<td>" . $value->destination  . "</td>";
    echo "<td>" . $value->duration  . "</td>";
    echo "<td>" . $value->price  . "</td>";
    echo "</tr>";
    $sum += $value->price;
    }
    echo "sum is {$sum}";