第六节--访问属性和方法 -- Classes and Objects in PHP5 [6_PHP

<?php class Room 
   { 
       public $name; 

       function __construct($name="unnamed") 
       { 
           $this->name = $name; 
       } 
   } 

   class House 
   { 
       //array of rooms 
       public $room; 
   } 

   //create empty house 
   $home = new house; 

   //add some rooms 
   $home->room[] = new Room("bedroom"); 
   $home->room[] = new Room("kitchen"); 
   $home->room[] = new Room("bathroom"); 

   //show the first room of the house 
   print($home->room[0]->name); 
?> 

<?php class Animal //动物 
   { 
       public $blood; //热血or冷血属性 
       public $name; 
       public function __construct($blood, $name=NULL) 
       { 
           $this->blood = $blood; 
           if($name) 
           { 
               $this->name = $name; 
           } 
       } 
   } 

   class Mammal extends Animal  //哺乳动物 
   { 
       public $furColor; //皮毛颜色 
       public $legs; 

       function __construct($furColor, $legs, $name=NULL) 
       { 
           parent::__construct("warm", $name); 
           $this->furColor = $furColor; 
           $this->legs = $legs; 
       } 
   } 

   class Dog extends Mammal   
   { 
       function __construct($furColor, $name) 
       { 
           parent::__construct($furColor, 4, $name); 

           self::bark(); 
       } 

       function bark() 
       { 
           print("$this->name says 'woof!'"); 
       } 
   } 

   $d = new Dog("Black and Tan", "Angus"); 
?>