Adapter(适配器模式)

这种模式允许使用不同的接口重构某个类，可以允许使用不同的调用方式进行调用：

<?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();
    }
}
 
// Usage
$book = new SimpleBook("Gamma, Helm, Johnson, and Vlissides", "Design Patterns");
$bookAdapter = new BookAdapter($book);
echo 'Author and Title: '.$bookAdapter->getAuthorAndTitle();
 
function echo $line_in) {
  echo $line_in."<br/>";
}