How can PHP be used to automatically calculate the sum of values entered in text fields?

To automatically calculate the sum of values entered in text fields using PHP, you can use JavaScript to dynamically update the sum as the user enters values. You can achieve this by attaching an event listener to the text fields to trigger a function that calculates the sum and updates a designated output field with the result. 

<!DOCTYPE html>
<html>
<head>
    <title>Calculate Sum of Text Fields</title>
</head>
<body>
    <input type="text" id="num1" oninput="calculateSum()">
    <input type="text" id="num2" oninput="calculateSum()">
    <input type="text" id="num3" oninput="calculateSum()">
    <p>Sum: <span id="sum"></span></p>

    <script>
        function calculateSum() {
            var num1 = parseFloat(document.getElementById("num1").value) || 0;
            var num2 = parseFloat(document.getElementById("num2").value) || 0;
            var num3 = parseFloat(document.getElementById("num3").value) || 0;
            var sum = num1 + num2 + num3;
            document.getElementById("sum").textContent = sum;
        }
    </script>
</body>
</html>

Keywords

PHP form processing input validation arithmetic operations dynamic calculations

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