What are the differences between using server-side and client-side scripting in PHP for form interactions?

When using server-side scripting in PHP for form interactions, the form data is processed on the server before being returned to the client. This allows for more secure data handling and validation. On the other hand, client-side scripting in PHP involves processing the form data on the client's browser before sending it to the server. This can provide a more interactive user experience but may be less secure as it relies on the client's browser to handle the data.

// Server-side form processing in PHP
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    // Validate form data
    if (!empty($name) && !empty($email)) {
        // Process form data
        // Send email, save to database, etc.
        echo "Form submitted successfully!";
    } else {
        echo "Please fill out all fields.";
    }
}