PHP继承

Question

我有以下3个班级:

class ParentClass {
    protected $myVar = array();

    function __construct() {
        var_dump($this->myVar);
    }
}

class FirstClass extends ParentClass {
    protected $myVar = array('defaultVal');
}

class SecondClass extends FirstClass {
    protected $myVar = array('anotherVal');
}

如果我要做以下事情:

$class = new SecondClass();

然后我会得到array('anotherVal')什么可以添加到ParentClass的构造,以便我实际上得到array('defaultVal', 'anotherVal')

提前致谢!

Answer 1

由于一些奇怪的原因,堆栈溢出会一直擦除我以前的答案.所以这是新的.

class ParentClass {
    protected $myVar;

    function __construct() {
        $this->myVar = array();
    }
}

class FirstClass extends ParentClass {
    function __construct() {
        parent::__construct();
        $this->myVar[] = 'default val';
    }
}

class SecondClass extends FirstClass {
    function __construct() {
        parent::__construct();
        $this->myVar[] = 'another val';
    }

    public function printArr() {
        print_r($this->myVar);
    }
}

$class = new Secondclass();
$class->printArr();