What are some common pitfalls to avoid when working with cookies and form submissions in PHP?

One common pitfall is not properly sanitizing and validating form input data before using it. This can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To avoid this, always use functions like htmlspecialchars() and mysqli_real_escape_string() to sanitize input data. 

// Sanitize and validate form input data
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);
$message = htmlspecialchars($_POST['message']);

// Connect to the database and insert the sanitized data
$conn = new mysqli($servername, $username, $password, $dbname);
$stmt = $conn->prepare("INSERT INTO messages (name, email, message) VALUES (?, ?, ?)");
$stmt->bind_param("sss", $name, $email, $message);
$stmt->execute();
$stmt->close();
$conn->close();

Keywords

cookies form submissions security vulnerabilities PHP functions data validation

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