}
class Stu extends Human{
}
class FreshMan extends Stu{
public function Say(){
echo '我要出国，做美得坚人!<br/>';
}
}
echo 'final修饰的方法可以继承<br />';
$ming = new Stu();
$ming->Say();
$ming->show();
echo '但不可以修改<br />';
$fr = new FreshMan();
$fr->Say();
$fr->show();
/*
Fatal error: Cannot override final method Human::Say()
*/
?>
* self:本类
* parent:父类
*
* 在引入自身的静态方法/静态属性
* 以及父类的方法，属性时用到
*
*/
class Human
{
public static $head = 1;
public $age = 28;
public function say()
{
echo $this->age;
}
public function show()
{
echo self::$head, 'hello<br />';
}
}
class Stu extends Human
{
public function show()
{
parent::show();
echo 'world';
}
}
$m = new Stu();
$m->show();
