How can interfaces be used in PHP to enforce certain methods in classes, as discussed in the forum thread?

To enforce certain methods in classes in PHP, interfaces can be used. By defining an interface with method signatures that classes must implement, we can ensure that specific methods are present in those classes. This helps in enforcing a certain structure or behavior across different classes that implement the interface.

interface LoggerInterface {
    public function log($message);
}

class FileLogger implements LoggerInterface {
    public function log($message) {
        // implementation for logging to a file
    }
}

class DatabaseLogger implements LoggerInterface {
    public function log($message) {
        // implementation for logging to a database
    }
}