interface LoggerFactory
{
    public function createLogger(): Logger;
}

class StdoutLoggerFactory implements LoggerFactory
{
    public function createLogger(): Logger{
    }
}
class FileLoggerFactory implements LoggerFactory
{
    public function createLogger(): Logger
    {
    }
}

interface Logger
{
    public function log(string $message);
}
class StdoutLogger implements Logger
{
    public function log(string $message)
    {
        echo $message;
    }
}
class FileLogger implements Logger
{
    private string $filePath;

    public function __construct(string $filePath)
    {
        $this->filePath = $filePath;
    }

    public function log(string $message)
    {
        file_put_contents($this->filePath, $message . PHP_EOL, FILE_APPEND);
    }
}