What are some key considerations when evaluating and processing form data in PHP?

When evaluating and processing form data in PHP, it is important to validate and sanitize the input to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. Additionally, you should always use prepared statements when interacting with a database to prevent SQL injection. It is also recommended to use built-in PHP functions like filter_var() to validate input data. 

// Example of validating and sanitizing form data in PHP

// Validate input data
$name = isset($_POST['name']) ? $_POST['name'] : '';
$email = isset($_POST['email']) ? $_POST['email'] : '';

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Sanitize input data
    $name = htmlspecialchars($name);
    $email = filter_var($email, FILTER_SANITIZE_EMAIL);

    // Process the form data
    // Code to save data to database or perform other actions
} else {
    echo "Invalid email address";
}

Keywords

Sanitization Validation XSS attacks CSRF protection Form handling

Related Questions