[PHP面向对象]④--访问控制private\protected

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<?php
//peoples republic of china
date_default_timezone_set("PRC");

class Human
{
    public $name;
    public $weight;
    protected $height;//只有自身和子类可以访问
    private $isHungry = true;//不能被子类访问

    public function isHungry()
    {
        echo $this->name . " is Hungry? " . $this->isHungry;
    }
}

class NbaPlayer extends Human
{
    public $team = "Bull";
    public $playerNumber = "23";
    private $age = 40;

    function __construct($name, $height)
    {
        $this->name = $name;//this 伪变量
        $this->height = $height;
    }

    public function getAge()
    {
        echo $this->name . "'s age is " . ($this->age - 2);
    }

}

$jordan = new NbaPlayer('hehe', '220cm');
$jordan->getAge();
echo "<br/>";
$jordan->isHungry();
//echo "<br/>".$jordan.$height;//无法访问
?>

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