php面向对象 final关键字

//final修饰的类无法被子类继承 
final class human{
	
}

class man extends human{
	
}

$m = new man();
//Fatal error: Class man may not inherit from final class (human)


// final修饰的方法无法重写父类的方法
class human{
	final function eat(){
		echo __METHOD__;	
	}
}

class man extends human{
	function eat(){
		echo __METHOD__;; 
	}
}

$m = new man();
$m->eat();
// atal error: Cannot override final method human::eat()