php--Final关键字

class BaseClass
{
    public function test(){
        echo "BaseClass::test() called<br>";
    }
    final public function moreTesting(){
        echo "BaseClass::moreTesting() called<br>";
    }
}
class ChildClass extends BaseClass
{
    public function moreTesting(){
        echo "BaseClass::moreTeing called<br>";
    }
}

final class BaseClass{
    public function test(){
        echo "BaseClass::test() called\n";
    }
    //这里无论你是否将方法声明为final，都没有关系
    final public function moreTesting(){
        echo "BaseClass::moreTesting() called\n";
    }
}
class ChildClass extends BaseClass{}
//产生Fatal Error:Class ChildClass may not inherit from final class (BaseClass)