What are the potential pitfalls of relying on client-side validation for field access control in PHP forms?

Relying solely on client-side validation for field access control in PHP forms can be risky as it can easily be bypassed by users who disable JavaScript or manipulate the client-side code. To ensure secure field access control, it is essential to implement server-side validation as well. 

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];

    // Server-side validation for field access control
    if (/* Add your validation logic here */) {
        // Process the form data
    } else {
        // Display an error message
    }
}

Keywords

client-side validation field access control PHP forms security vulnerabilities error handling

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