This question already has an answer here:
It's supposed to look like this: sample output. It will only say "Price must be a valid number" and nothing else when I test it, even when my inputs are correct numbers, it still won't calculate. I don't know what I am doing wrong here.
Here is the index.php
<?php
//set default value of variables for initial page load
if (!isset($description)) { $description = ''; }
if (!isset($unit_price)) { $unit_price = ''; }
if (!isset($quantity)) { $quantity = ''; }
?>
<!DOCTYPE html>
<html>
<head>
<title>Assignment 1</title>
<link rel="stylesheet" type="text/css" href="YapAss1.css">
</head>
<body>
<main>
<h1>Cashier</h1>
<?php if (!empty($error_message)) { ?>
<p class="error"><?php echo htmlspecialchars($error_message); ?> </p>
<?php } ?>
<form action="checkout.php" method="post">
<div id="data">
<label>Description:</label>
<input type="text" name="investment"
value="<?php echo htmlspecialchars($description); ?>">
<br>
<label>Unit Price:</label>
<input type="text" name="interest_rate"
value="<?php echo htmlspecialchars($unit_price); ?>">
<br>
<label>Quantity:</label>
<input type="text" name="years"
value="<?php echo htmlspecialchars($quantity); ?>">
<br>
</div>
<div id="buttons">
<label> </label>
<input type="submit" value="Checkout Now"><br>
</div>
</form>
</main>
</body>
</html>
checkout.php
<?php
// get the data from the form
$description = filter_input(INPUT_POST, 'description',
FILTER_VALIDATE_FLOAT);
$unit_price = filter_input(INPUT_POST, 'unit_price',
FILTER_VALIDATE_FLOAT);
$quantity = filter_input(INPUT_POST, 'quantity',
FILTER_VALIDATE_INT);
if ( $unit_price === FALSE ) {
$error_message = 'Price must be a valid number.';
} else if ( $unit_price <= 0 ) {
$error_message = 'Price must be a valid number.';
// validate quantity
} else if ( $quantity === FALSE ) {
$error_message = 'Quantity must be a valid number.';
} else if ( $quantity <= 0 ) {
$error_message = 'Quantity must be a valid number.';
} else {
$error_message = '';
}
// if an error message exists, go to the index page
if ($error_message != '') {
include('index.php');
exit();
}
// calculate the future value
$sales_tax = .07;
$sub_total = $price * $quantity;
$total = $subtotal * $sales_tax;
// apply currency and percent formatting
$unit_price_f = '$'.number_format($unit_price, 2);
$quantity_f = '$'.number_format($quantity, 2);
$sub_total_f ='$'.number_format($sub_total, 2);
$sales_tax_f = $sales_tax.'%';
$total_f ='$'.number_format($total, 2);
?>
<!DOCTYPE html>
<html>
<head>
<title>Assignment 1</title>
<link rel="stylesheet" type="text/css" href="YapAss1.css">
</head>
<body>
<main>
<h1>Checkout 12/27/2015</h1>
<label>Item Description:</label>
<span><?php echo $description; ?></span><br>
<label>Price:</label>
<span><?php echo $unit_price_f; ?></span><br>
<label>Quantity:</label>
<span><?php echo $quantity_f; ?></span><br>
<label>Sub Total:</label>
<span><?php echo $sub_total_f; ?></span><br>
<label>Sales Tax:</label>
<span><?php echo $sales_tax; ?></span><br>
<label>Total:</label>
<span><?php echo $total_f; ?></span><br>
</main>
</body>
</html>
</div>
