How can the E-V-A principle be applied to PHP form processing?

The E-V-A principle (Escape, Validate, and Aggregate) can be applied to PHP form processing by first escaping user input to prevent SQL injection and XSS attacks, then validating the input to ensure it meets the required criteria, and finally aggregating the input data for further processing or storage. 

// Escape user input
$username = mysqli_real_escape_string($conn, $_POST['username']);
$email = mysqli_real_escape_string($conn, $_POST['email']);

// Validate input
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Invalid email format";
    exit;
}

// Aggregate input data
$userData = [
    'username' => $username,
    'email' => $email
];

// Further processing or storage of $userData

Keywords

validation sanitization error handling security form processing

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