In the context of PHP registration forms, what are some common pitfalls to watch out for when handling user input validation and database interactions?

One common pitfall is not properly sanitizing user input before inserting it into the database, leaving the system vulnerable to SQL injection attacks. To solve this, always use prepared statements or parameterized queries to securely interact with the database. 

// Example of using prepared statements to insert user input into the database

// Assuming $conn is the database connection object

$username = $_POST['username'];
$email = $_POST['email'];

$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $email);

$stmt->execute();

$stmt->close();
$conn->close();

Keywords

SQL injection XSS attacks form validation prepared statements PDO

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