What are some common pitfalls for beginners when working with PHP, especially in creating register/login systems?

One common pitfall for beginners when working with PHP in creating register/login systems is not properly sanitizing user input, leaving the system vulnerable to SQL injection attacks. To solve this issue, always use prepared statements with parameterized queries to interact with the database. 

// Example of using prepared statements to prevent SQL injection

// Assuming $username and $password are user inputs
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username AND password = :password");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();
$user = $stmt->fetch();

Keywords

SQL injection password hashing session management form validation cross-site scripting

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