What are some common pitfalls to avoid when using PHP to create a rating system that retrieves data from a database?

One common pitfall to avoid when creating a rating system in PHP that retrieves data from a database is not sanitizing user input properly. This can leave your application vulnerable to SQL injection attacks. To prevent this, always use prepared statements when querying the database to ensure that user input is properly escaped. 

// Connect to database
$pdo = new PDO("mysql:host=localhost;dbname=your_database", "username", "password");

// Sanitize user input
$rating = filter_input(INPUT_POST, 'rating', FILTER_SANITIZE_NUMBER_INT);
$item_id = filter_input(INPUT_POST, 'item_id', FILTER_SANITIZE_NUMBER_INT);

// Prepare SQL statement
$stmt = $pdo->prepare("INSERT INTO ratings (item_id, rating) VALUES (:item_id, :rating)");
$stmt->bindParam(':item_id', $item_id, PDO::PARAM_INT);
$stmt->bindParam(':rating', $rating, PDO::PARAM_INT);

// Execute SQL statement
$stmt->execute();

Keywords

SQL injection data validation prepared statements XSS attacks database normalization

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