What potential pitfalls should be considered when using PHP to handle guestbook entries and user inputs?

One potential pitfall when handling guestbook entries and user inputs in PHP is the risk of SQL injection attacks if user inputs are not properly sanitized. To mitigate this risk, it is important to use prepared statements or parameterized queries when interacting with a database to prevent malicious SQL code from being executed. 

// Using prepared statements to handle user inputs in PHP
$stmt = $pdo->prepare("INSERT INTO guestbook (name, message) VALUES (:name, :message)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':message', $message);
$stmt->execute();

Keywords

SQL injection cross-site scripting form validation data sanitization input filtering

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