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I created a form which works using cookies in PHP. This is how the form looks like.
When I put values for price and quantity, I want them to get multiplied and the result to be displayed in the "Total Bill Value" textbox. Each time I put values for price and quantity, I want them to get added up, which is why I have used a cookie. This is my code.
<html>
<head></head>
<body>
<?php
if($_SERVER["REQUEST_METHOD"] == "POST")
{
$result=0;
if(isset($_POST["btnReset"]))
{
setcookie("result", $result);
}
elseif(isset($_POST["btnClick"]))
{
if(isset($_COOKIE["result"]))
{
$result=$_COOKIE["result"];
}
$result= $result + $_POST["Price"]*$_POST["Quantity"];
setcookie("result", $result);
}
else
{
if(isset($_COOKIE["result"]))
{
echo "something";
}
}
}
?>
<?php
if (isset($result)) {
$bill = $result;
} else {
$bill = '';
}
?>
<form method="POST" >
<ul style="list-style-type:none;">
<li>
Product Name: <input type="text" name="ProductName"> <br>
Price: <input type="number" name="Price" value="price"> <br>
Quantity: <input type="number" name="Quantity" value="qty"><br>
<input type="submit" name="btnClick" value="Add">
<input type="submit" name="btnReset" value="Clear">
<input type="submit" name="btnPrint" value="Print"><br>
Total Bill Value: <input type="text" name="Bill" value="<?php echo $bill; ?>">
</li>
</ul>
</form>
</body>
</html>
But whenever I click the "Add" button, I'm getting this error
Line 21 is this
$result= $result + $_POST["Price"]*$_POST["Quantity"];
Does anybody know why I'm getting that error??
And the other thing is, when I enter product name, price and quantity and get the total bill value and do that for many products and hit on the "Print" button, I want all the products with their total bill values to get printed out. How do I do this?
Would really appreciate any help. Thanks in advance!
Edit: So I did a var_dump to $result
and this is what I got
First thing I would do is move your PHP code above the opening<html> tag, this will help avoid warnings withsetcookie (for example).
I've rewritten your code slightly, renaming the buttons and values. It's been tested in PHP version 5.4.45.
<?php
// Default result value
$result = 0;
if ( !empty( $_POST ) ) {
$cookie_key = 'result';
$action = !empty( $_POST[ 'action' ] ) ? $_POST[ 'action' ] : false;
$result = !empty( $_COOKIE[ $cookie_key ] ) ? (float)$_COOKIE[ $cookie_key ] : $result;
// Add product
if ( $action === 'add' ) {
$price = !empty( $_POST[ 'Price' ] ) ? (float)$_POST[ 'Price' ] : 0;
$quantity = !empty( $_POST[ 'Quantity' ] ) ? (int)$_POST[ 'Quantity' ] : 0;
if ( $price && $quantity ) {
$result = $result + ( $price * $quantity );
}
}
// Clear result
else if ( $action === 'clear' ) {
$result = 0;
}
// Print
else if ( $action === 'print' ) {
// Handle print action
}
// Store value
setcookie( $cookie_key, $result );
}
?>
<html>
<head></head>
<body>
<form method="POST" >
<ul style="list-style-type:none;">
<li>
Product Name: <input type="text" name="ProductName"> <br>
Price: <input type="number" name="Price" value="price"> <br>
Quantity: <input type="number" name="Quantity" value="qty"><br>
<input type="submit" name="action" value="add">
<input type="submit" name="action" value="clear">
<input type="submit" name="action" value="print"><br>
Total Bill Value: <input type="text" name="Bill" value="<?php echo $result; ?>">
</li>
</ul>
</form>
</body>
</html>
Here it is in action:
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
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