What are common pitfalls when creating a login system with individual user areas in PHP?

One common pitfall when creating a login system with individual user areas in PHP is not properly sanitizing user input, which can lead to SQL injection attacks. To solve this issue, always use prepared statements or parameterized queries to interact with the database. 

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

// Sanitize user input and create a prepared statement
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$password = filter_var($_POST['password'], FILTER_SANITIZE_STRING);

$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username AND password = :password');
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

// Check if the user exists
if($stmt->rowCount() > 0) {
    // User authenticated, proceed to user area
} else {
    // Invalid credentials, show error message
}

Keywords

SQL injection password hashing session management CSRF protection secure authentication.

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