What additional security measures can be taken to protect against unauthorized access and attacks in PHP CMS development?

To protect against unauthorized access and attacks in PHP CMS development, additional security measures can be taken such as implementing input validation, using prepared statements to prevent SQL injection, enforcing strong password policies, and regularly updating the CMS software to patch any security vulnerabilities. 

// Example of input validation using filter_var
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$password = filter_var($_POST['password'], FILTER_SANITIZE_STRING);

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

// Example of enforcing strong password policies
if(strlen($password) < 8 || !preg_match('/[A-Za-z]/', $password) || !preg_match('/\d/', $password)) {
    // Password does not meet requirements
}

// Example of updating CMS software
// Check for updates and apply patches regularly

Keywords

SQL injection Cross-site scripting (XSS) CSRF protection Content Security Policy (CSP) Two-factor authentication

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