What are some potential pitfalls to be aware of when creating a forum using PHP?

One potential pitfall when creating a forum using PHP is SQL injection attacks. To prevent this, always use prepared statements when interacting with your database to sanitize user input. 

// Using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username);
$stmt->execute();

Keywords

SQL injection cross-site scripting session management user authentication data validation

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