adapter

<?php
class SimpleBook {
    private $author;
    private $title;
    function __construct($author_in, $title_in) {
        $this->author = $author_in;
        $this->title  = $title_in;
    }
    function getAuthor() {
        return $this->author;
    }
    function getTitle() {
        return $this->title;
    }
}
class BookAdapter {
    private $book;
    function __construct(SimpleBook $book_in) {
        $this->book = $book_in;
    }
    function getAuthorAndTitle() {
        return $this->book->getTitle().' by '.$this->book->getAuthor();
    }
}
  // client
  writeln('BEGIN TESTING ADAPTER PATTERN');
  writeln('');
  $book = new SimpleBook("Gamma, Helm, Johnson, and Vlissides", "Design Patterns");
  $bookAdapter = new BookAdapter($book);
  writeln('Author and Title: '.$bookAdapter->getAuthorAndTitle());
  writeln('');
  writeln('END TESTING ADAPTER PATTERN');
  function writeln($line_in) {
    echo $line_in."<br/>";
  }
?>