php将变量复制到类的扩展版本

Question

I have 2 classes that one of them extends another:

class a{
    private $name;
    public function __construct(){

    }
    public function get($v){
        $this->name=$v;
    }
}
class b extends a{
    public $user;
}

at top of page I'm creating an object:

$a=new a();
$a->get(1234);

and then I'm creating another object from class b.

$b=new b();

but I want to copy all current variables of $a to $b. so class $b would have variable $name with value 1234.

how can I do this?

Answer 1

Add a constructor to b that takes a parameter of type a?

class b extends a{
    public $user;

    function __construct(a $a)
    {
         parent::__construct($a.name);
    }
}