What are common pitfalls when coding a forum in PHP?

Common pitfalls when coding a forum in PHP include not properly sanitizing user input, not handling database queries securely, and not implementing proper user authentication and authorization. To solve these issues, always use prepared statements to prevent SQL injection attacks, validate and sanitize user input to prevent cross-site scripting attacks, and implement user authentication and authorization checks to control access to forum functionalities. 

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

// Example of validating and sanitizing user input
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$message = filter_var($_POST['message'], FILTER_SANITIZE_STRING);

// Example of implementing user authentication and authorization
if($_SESSION['user_id'] != $post['user_id']) {
    die("You do not have permission to edit this post.");
}

Keywords

SQL injection Cross-site scripting Session hijacking CSRF attacks User authentication

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