What are some common pitfalls when using PHP to process form data and interact with databases?

One common pitfall is not properly sanitizing user input, which can lead to SQL injection attacks. To prevent this, always use prepared statements or parameterized queries when interacting with databases. 

// Example of using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("INSERT INTO users (username, password) VALUES (:username, :password)");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

Keywords

SQL injection XSS attacks PDO prepared statements data validation

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