What are common challenges when building a CMS in PHP?

One common challenge when building a CMS in PHP is handling user authentication and authorization securely. To solve this, it's important to use secure hashing algorithms like bcrypt for storing passwords and implement proper user role management to control access to different parts of the CMS.

// Example of using bcrypt for password hashing
$password = "secret_password";
$hashed_password = password_hash($password, PASSWORD_BCRYPT);
```

```php
// Example of user role management
$user_role = "admin";

if($user_role == "admin"){
    // Allow access to admin features
} else {
    // Restrict access to regular user features
}