What is the difference between server-side programming languages like PHP and client-side languages like JavaScript in terms of form validation and calculations?

Server-side programming languages like PHP are used for form validation and calculations on the server before any data is sent to the client. This ensures that the data submitted by the user is secure and accurate. On the other hand, client-side languages like JavaScript are used for form validation and calculations on the user's browser, which can be faster and provide immediate feedback to the user. 

// Server-side form validation in PHP
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST['name'];
    $email = $_POST['email'];

    // Validate form inputs
    if (empty($name) || empty($email)) {
        echo "Please fill out all fields";
    } else {
        // Process form data
        // Perform calculations or database operations
    }
}

Keywords

PHP JavaScript server-side client-side form validation

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