PHP類訪問控制修飾符

<?PHP/*w  w w  .j av  a 2 s  . co m*/
class Book {
        public $Name;
        public function say() {
                print "PHP!\n";
        }
}
class PythonBook extends Book {
        public function say() {
                print "Python!\n";
        }
}

$aBook = new PythonBook;
$aBook->Name = "Python";
print $aBook->Name;
?>

<?PHP
class Book {
        private $Name;
        private $NameTag;
        public function setName($NewName) {
                // etc
        }
}
?>

<?PHP//from  w w  w.j  a  v a 2  s  .  co m
class Book {
        public $Name;
        protected function getName() {
                return $this->Name;
        }
}

class Poodle extends Book {
        public function say() {
                print ""Book", says " . $this->getName();
        }
}

$aBook = new Poodle;
$aBook->Name = "PHP";
$aBook->say();
?>

//from  w w  w. ja  va 2s .  c  o  m
<?php
  class Widget
  {
    private $name;
    private $price;
    private $id;

    public function __construct($name, $price)
    {
      $this->name = $name;
      $this->price = floatval($price);
      $this->id = uniqid();
    }

    //checks if two widgets are the same
    public function equals($widget)
    {
      return(($this->name == $widget->name) AND
       ($this->price == $widget->price));
    }
  }

  $w1 = new Widget("Cog", 5.00);
  $w2 = new Widget("Cog", 5.00);
  $w3 = new Widget("Gear", 7.00);

  //TRUE
  if($w1->equals($w2))
  {
    print("w1 and w2 are the same<br>\n");
  }

  //FALSE
  if($w1->equals($w3))
  {
    print("w1 and w3 are the same<br>\n");
  }

  //FALSE, == includes id in comparison
  if($w1 == $w2)
  {
    print("w1 and w2 are the same<br>\n");
  }
?>