What are some common pitfalls when using PHP to create dynamic forms based on user selections?

One common pitfall when creating dynamic forms in PHP based on user selections is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection attacks. To solve this issue, always use prepared statements or parameterized queries when interacting with a database to prevent malicious input from affecting your database. 

// Example of using prepared statements to prevent SQL injection
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();

// Fetch data from the query result
$result = $stmt->fetch(PDO::FETCH_ASSOC);

Keywords

PHP dynamic forms user selections validation error handling

Related Questions