How can JavaScript be utilized in conjunction with PHP to achieve on-the-fly price calculations in a web form?

To achieve on-the-fly price calculations in a web form, JavaScript can be used to dynamically update the total price based on user input, while PHP can be used to handle the backend calculations and processing of the form data. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $quantity = $_POST['quantity'];
    $price = 10; // Price per item
    $total = $quantity * $price;
    echo "Total Price: $" . $total;
}
?>

Keywords

JavaScript PHP on-the-fly price calculations web form

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