Правильно ли я использую класс?

class Otchet
{
	private $name;
	private $boss;
	private $directors = array();

	public function __construct($name)
	{
		$this->name = $name;
	}
	
	public function setBoss($name)
	{
		$this->boss = $name;
	}
	
	public function replaceBoss($name)
	{
		if(!empty($boss))
		{
			$this->boss = $boss;
		}
	}

	public function addDirector($name)
	{
		$this->directors[] = $name;
		
		$this->directors = array_unique($this->directors);
	}

    public function delDirector($name)
	{
		if(($key = array_search($name, $this->directors)) !== false)
		{
			unset($this->directors[$key]);
		}
	}
	
	private function generate_otchet_name()
	{
		return date('Y-m-d-H-i').'.txt';
	}
	
	public function save($filename = '')
	{
		if(empty($filename))
		{
			$filename = $this->generate_otchet_name();
		}
		
		$content = "Название отчета: ".$this->name."\n";
		$content .= "Директор: ".$this->boss."\n";
		if(count($this->directors) > 0)
		{
			$content .= "Зам директора: ".implode(', ', $this->directors);
		}
		
		if(file_put_contents($filename, $content))
		{
			return 'Отчет сохранен';
		}
		else
		{
			return 'Ошибка сохранения';
		}
	}
}

if(isset($_POST['name'], $_POST['boss'], $_POST['director']))
{
	$f = new Otchet($_POST['name']);
	$f->setBoss($_POST['boss']);
	
	if(is_array($_POST['director']) && count($_POST['director']) > 0)
	{
		foreach($_POST['director'] as $v)
		{
			$f->addDirector($v);
		}
	}
	
	echo $f->save();
}

<form method="post" action="#">
<input type="text" name="name" placeholder="Введите название отчета" /><br />
<input type="text" name="boss" placeholder="Ген директор" /><br />
<input type="text" name="director[]" placeholder="1-й зам директора" />
<input type="text" name="director[]" placeholder="2-й зам директора" />
<input type="text" name="director[]" placeholder="3-й зам директора" />
<input type="submit" value="Создать" />
</form>