";
}
}
/**
* 爷爷继承人类
*/
class Ye extends Person
{
public function say()
{
echo "我是爷爷,我会说话
";
}
}
/**
* 父亲继承爷爷
*/
class Father extends Ye
{
}
/**
* 儿子继承父亲
*/
class Son extends Father
{
}测试:
$son = new son(); $son->say(); $son->walk();
结果
