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Editorial Team
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Asked: 2026-05-24T04:16:36+00:00

I’m trying to make a simple budget form. What I need is that if

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I’m trying to make a simple budget form. What I need is that if some item is checked the system adds the price of these item (and if unchecked that item again substract it’s price of the total).

<form name="myform" method ='post'>
<input name="item" type="checkbox" value="flowers"/>
<input name="item" type="checkbox" value="animals"/>
</form>

And what I want is something like

if (item[1].checked) $total_price = $total_price + item[1];

And likewise

if (item[1].unchecked) $total_price = $total_price - item[1];
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1 Answer

  1. Editorial Team

    Here is a quick example of how you might implement the above. I have not tested it, but it is something to get started with.

    <?php

$price_list = array(
    'animals' => 100,
    'flowers' => 50
);

// Has data from form been posted back?
if (!empty($_POST)) {
    $total_price = 0;

    foreach ($_POST['item'] as $item) {
        // Is price available for item?
        if (isset($price_list[ $item ]))
            $total_price += $price_list[ $item ];
        else
            throw new Exception('Invalid item: ' . $item);
    }

    echo 'Total Price: ', $total_price;

    // End script before form is shown again.
    die;
}

?>
<!DOCTYPE html>
<html>
<head>
    <title>Item Counter</title>
</head>
<body>
    <form action="" method="post">
        <input id="itemFlowers" name="item[]" type="checkbox" value="flowers"/>
        <label for="itemFlowers">Flowers $<?php echo $price_list['flowers']; ?></label>
        <input id="itemAnimals" name="item[]" type="checkbox" value="animals"/>
        <label for="itemAnimals">Animals $<?php echo $price_list['animals']; ?></label>

        <input name="submit" type="submit" value="Submit" />
    </form>
</body>
</html>
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