Calculating total price php

Question

Right now i have this piece of code running:

$count = 0;
    foreach ($products as $key => $product){
      $number = isset($_POST[$key])?$_POST[$key]:'';
            if (!$number){
            $count++;
            echo "";
            } else {
        echo "<tr>";
            echo "<td>";
                echo $product;
            echo "</td>";
            echo "<td>";
                echo $number;
            echo "</td>";
            echo "<td>";
                $price = $prices[$count]* $number;
                echo "&#8364 ", $price;
            echo "</td>";
        echo "</tr>";

        $count++;
        }
    }

But now i added a 3rd row (my first row is just the <th>'s) beneath that one looking like this:

echo "<tr>";
    echo "<td>";
        echo "Totaal";
    echo "</td>";
    echo "<td>";
        echo $totalproducts;
    echo "</td>";
    echo "<td>";
        echo $totalprice;
    echo "</td>";
echo "</tr>";

As you can see i placed 2 $total... in this row where as you can guess need to come the total products ordered and total price of those products.

My problem is that i don't really know how to let it sum up all the $price and place this in $totalprice and sum up all $number and place it inside the $totalnumber. I know it's a basic question but it has been a long time ago since i actually worked with php. And i'm stuck on this.

I appreciate any help on this matter, thanks in advance!

Answer 1

Try this...

$totalprice=0;
$count = 0;
    foreach ($products as $key => $product){
      $number = isset($_POST[$key])?$_POST[$key]:'';
            if (!$number){
            $count++;
            echo "";
            } else {
        echo "<tr>";
            echo "<td>";
                echo $product;
            echo "</td>";
            echo "<td>";
                echo $number;
            echo "</td>";
            echo "<td>";
                $price = $prices[$count]* $number;
                $totalprice = $totalprice+ $price;
                echo "&#8364 ", $price;
            echo "</td>";
        echo "</tr>";

        $count++;
        }
    }

and

echo "<tr>";
    echo "<td>";
        echo "Totaal";
    echo "</td>";
    echo "<td>";
        echo $total_products;
    echo "</td>";
    echo "<td>";
        echo $totalprice;
    echo "</td>";
echo "</tr>";

Answer 2

i hope you want this

first set the variable $total_products and $total_price

$total_products = 0; // set to 0 initially
$total_price = 0; // set to 0 initially

    $count = 0;
        foreach ($products as $key => $product){
          $number = isset($_POST[$key])?$_POST[$key]:'';
                if (!$number){
                $count++;
                echo "";
                } else {
            echo "<tr>";
                echo "<td>";
                    echo $product;
                echo "</td>";
                echo "<td>";
                    echo $number;
                echo "</td>";
                echo "<td>";
                    $price = $prices[$count]* $number;
                    echo "&#8364 ", $price;
                echo "</td>";
            echo "</tr>";

            $total_products += 1; // update total_products +1
            $total_price += $price;  // update total_price +$price
            $count++;
            }
        }

and put them here like

echo "<tr>";
    echo "<td>";
        echo "Totaal";
    echo "</td>";
    echo "<td>";
        echo $total_products;
    echo "</td>";
    echo "<td>";
        echo $total_price;
    echo "</td>";
echo "</tr>";