What are the potential pitfalls of using JavaScript to manipulate input fields in PHP forms?

One potential pitfall of using JavaScript to manipulate input fields in PHP forms is that the client-side manipulation can bypass server-side validation and security measures, leaving the form vulnerable to attacks such as cross-site scripting (XSS) or SQL injection. To mitigate this risk, it is important to always perform validation and sanitization on the server side before processing the form data. 

// Server-side validation and sanitization example
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = filter_var($_POST["username"], FILTER_SANITIZE_STRING);
    $password = filter_var($_POST["password"], FILTER_SANITIZE_STRING);

    // Perform further validation and processing here
}

Keywords

JavaScript input fields PHP forms manipulation potential pitfalls

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