What are common mistakes to avoid when creating a PHP login script?

One common mistake to avoid when creating a PHP login script is storing passwords in plain text. To enhance security, passwords should be hashed before being stored in the database. Another mistake is not using prepared statements to prevent SQL injection attacks. It's important to sanitize user input and validate credentials securely. 

// Example of hashing passwords before storing them in the database
$password = password_hash($_POST['password'], PASSWORD_DEFAULT);

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

Keywords

SQL injection password hashing session management CSRF protection secure authentication.

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