PHP/Design Patterns/Decorator Pattern

Design Patterns Decorator

   <source lang="html4strict">

<?

 class Name {
   private $firstName;
   private $lastName;
   function __construct($lastName_in, $firstName_in) {
     $this->firstName = $firstName_in;
     $this->lastName  = $lastName_in;
   }
   function getFirstName() {
       return $this->firstName;
   }
   function getLastName() {
       return $this->lastName;
   }
   function getFirstNameAndLastName() {
     return $this->getLastName() . " by " . $this->getFirstName();
   }
 }

 class LastNameDecorator {
 
   protected $name;
 public $lastName;
 
   public function __construct(Name $name_in) {
   $this->name = $name_in;
     $this->resetLastName();
   }
 
 function resetLastName() {
   $this->lastName = $this->name->getLastName();
 }
   function showLastName() {
   return $this->lastName;
 }
 }
 
 
 class LastNameExclaimDecorator extends LastNameDecorator {
 
   private $btd;
   public function __construct(LastNameDecorator $btd_in) {
      $this->btd = $btd_in;
   }
   function exclaimLastName() {
      $this->btd->lastName = "!" . $this->btd->lastName . "!";
 }
 }
 class LastNameStarDecorator extends LastNameDecorator {
 private $btd;
   public function __construct(LastNameDecorator $btd_in) {
   $this->btd = $btd_in;
   }
   function starLastName() {
   $this->btd->lastName = Str_replace(" ","*",$this->btd->lastName);
 }
 }
 
 
 
 $patternName = new Name("A","B");
       
 $decorator = new LastNameDecorator($patternName);
 $starDecorator = new LastNameStarDecorator($decorator);
 $exclaimDecorator = new LastNameExclaimDecorator($decorator);
 
 echo $decorator->showLastName();
 
 $exclaimDecorator->exclaimLastName();
 $exclaimDecorator->exclaimLastName();
 echo $decorator->showLastName();
 
 $starDecorator->starLastName();
 echo $decorator->showLastName();
 
 echo $decorator->resetLastName();
 echo $decorator->showLastName();      

?>

      </source>