Livre :

/home/homes/homes/paulbourgeon/sites/PHP/J-11/heritage/exo0.5.php:54:
object(Book)[1]
  protected string 'title' => string 'Les Misérables' (length=15)
  protected string 'writer' => string 'Victor Hugo' (length=11)

Comic Book :

/home/homes/homes/paulbourgeon/sites/PHP/J-11/heritage/exo0.5.php:59:
object(ComicBook)[2]
  protected string 'title' => string 'Asterix' (length=7)
  protected string 'writer' => string 'Goscinny' (length=8)
  private string 'artist' => string 'Uderzo' (length=6)