09-24 code

<?

class  bird{

private $color;
private $chibang;
private $zhuazi;
private $yumao;
const gold='0.618';

function __construct(){

echo "[Construct parent]I Can Fly";
}

function fly(){

echo "I really Can Fly"."<br/>";
}

final function sound(){//只能修饰成员方法 和 类

echo "I Like SingSong";
}

static function dance(){

echo "I Like Dance";
}

}
class chicken extends bird{

private $color;
private $chibang;
private $zhuazi;
private $yumao;
protected $giveegg;

function __construct(){

echo "[Construct self]Not only i am a bird(chicken),but also i can't fly"."<br/>";

self::fly();//在自身调用方法//作用域
}//重载

function fly(){

echo "Not only i am a bird(chicken),but also i can't fly"."<br/>";

parent::fly();//在重载子类里访问父类被重载方法//作用域
}

function high(){

echo $this->giveegg='twenty_egg';

}
}

$chicken=new chicken;
echo "<pre>";
var_dump($chicken);
echo "</pre>";
echo "<br/>";

echo "<hr/>";
$chicken->fly();
echo bird::sound();//final只能修饰成员方法 和 类 //限制类的继承 方法的覆盖

echo bird::gold;//常量的输出使用作用域
echo "<hr/>";
$chicken->high();//protected类内调用

echo "<hr/>";
echo chicken::dance();