I have a problem with my number format in php

Question

I want to allow my users to store values in the $_SESSION variable, I have this code:

<?php
if(!empty($_SESSION["shopping_cart"])) {
    $total = 0;
    foreach($_SESSION["shopping_cart"] as $keys => $values) { ?>
        <tr>
            <td><?php echo $values["item_name"]; ?></td>
            <td><?php echo $values["item_quantity"]; ?></td>
            <td>฿<?php echo $values["item_price"]; ?></td>
            <td><?php echo number_format($values["item_quantity"] *
                    $values["item_price"], 7); ?></td>
            <td><a href="atcform.php?action=delete&id=<?php echo $values["item_id"]; ?>
            "><span class="remove-span">Remove</span></a></td>
        </tr>
        <?php
        $total = $total + ($values["item_quantity"] * $values["item_price"]);
    }
    ?>
    <tr>
        <td colspan="3" align="right">Total</td>
        <td align="right">$<?php echo number_format($total, 7); ?></td>
    </tr>
    <?php
}
?>

When I run it it says:

Notice: A non well formed numeric value encountered in C:\\Users\\auser\\Desktop\\XAMPP\\htdocs\\Website1\\atcform.php on line 76 and line 72

Those two lines are where the number_format s are, I would like to eliminate these errors, do tell me if you need to see more code.

Here's a current picture:

Thank you!

Answer 1

Looks like one of the values inside of number_format() are not of a numerical type.

Try casting the numerical values in floatval() :

number_format(floatval($values["item_quantity"]) * floatval($values["item_price"]), 7);

Or even better, ensure that the values are floats before doing any numerical operation on them by re-assigning them at the beginning of the loop.

foreach ($_SESSION["shopping_cart"] as $keys => $values) { 
    $values["item_quantity"] = floatval($values["item_quantity"]);
    $values["item_price"] = floatval($values["item_price"]);
....