What best practices should be followed when handling user authentication and authorization in PHP applications?

When handling user authentication and authorization in PHP applications, it is important to follow best practices to ensure the security of user data and access control. This includes using secure password hashing algorithms, implementing CSRF protection, validating user input, and using prepared statements to prevent SQL injection attacks. 

// Example of secure password hashing using password_hash function
$password = $_POST['password'];
$hashed_password = password_hash($password, PASSWORD_DEFAULT);

// Example of validating user input using filter_var function
$email = $_POST['email'];
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Invalid email format
}

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

Keywords

password hashing session management CSRF protection role-based access control secure coding practices

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