How to calculate total price in php

I am getting the price of the product from db using the product id i have stored in php array.

i have a php function where in i want to hold a total of all the products purchased. here i am getting the cart items and i am calling the function which should hold total amount. i am passing the value price each time when i retrieve the product from cart.

for example for first item iteration i send value 300, and for second 400, for third 900.

i want to add up all these and get total price of 1600 in payableAmount() how can i do this?

function getCartitems($product_id){
    $conn = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    } 
    $sql = "SELECT product_id,product_name,product_price,product_image_url FROM product_list WHERE product_id='$product_id'";
    $result = $conn->query($sql);      
    if ($result->num_rows > 0) {
        while($row = $result->fetch_assoc()) {              
        echo "<tr><td><img class='cart-image img-responsive' src='".$row["product_image_url"]."'></td><td>".$row["product_name"]."</td><td><b>₹ </b>".floor($row["product_price"])."</td><td><a href='mycart.php?action=remove&product_id=".$row['product_id']."'><span class='glyphicon glyphicon-remove'></span> remove</a></td></tr>";
        $price = $row['product_price'];
        payableAmount($price);      
        }
    } else {
        echo "There are no such items";
    }   
    $conn->close();
}

function payableAmount($totalPrice){    
   // calculate total price here
    $total = $totalPrice;
    echo $total;
}

Answer

You just simply update your query instead like as

$total_price = 0;
while($row = $result->fetch_assoc()) {              
  echo "<tr><td><img class='cart-image img-responsive' src='".$row["product_image_url"]."'></td><td>".$row["product_name"]."</td><td><b>₹ </b>".floor($row["product_price"])."</td><td><a href='mycart.php?action=remove&product_id=".$row['product_id']."'><span class='glyphicon glyphicon-remove'></span> remove</a></td></tr>";
  $total_price += $row['product_price'];
}

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Answer