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PHP kode 

 <?php
  class Bog {
      public $title;
      public $author;
   
      function __construct($title = "", $author = "") {
          $this->title = $title;
          $this->author = $author;
      }
      
      function setTitle($name) {
          $this->title = $name;
      }
      
      function getTitle() {
          echo $this->title;
      }
      
      function setAuthor($name) {
          $this->author = $name;
      }
      
      function getAuthor() {
          echo $this->author;
      }
  }
  
  class Roman extends Bog { }
  
  class Fagbog extends Bog {
      public $genre;
      
      function setGenre($name) {
          $this->genre = $name;
      }
      
      function getGenre() {
          echo $this->genre;
      }
  }
   
  $book[] = new Roman();
  $book[] = new Fagbog();
  $book[0]->setTitle("Titel-Roman");
  $book[0]->getTitle();
  $book[0]->setAuthor("Author-Roman");
  $book[0]->getAuthor();
  $book[1]->setTitle("Titel-Fagbog");
  $book[1]->getTitle();
  $book[1]->setAuthor("Author-Fagbog");
  $book[1]->getAuthor();
  $book[1]->setGenre("Genre-Fagbog");
  $book[1]->getGenre();
 
  $book[] = new Roman("titel1", "author1");
  $book[] = new Fagbog("titel2", "author2");
  $book[2]->getTitle();
  $book[2]->getAuthor();
  $book[3]->getTitle();
  $book[3]->getAuthor();