How to new a Object via class name String?

["ked" <kd@xxxxxxxxxxx>]

Hi  , I'm a  freshman in PHP, can anyone give me any  advices?

I defied some simple classes, like "User", "Item"...

in a general way ,
 $obj = new User(); 

specially, I need  to assign a Object via a class name .

Now , my code :
 switch ($className)
{
 case "User":
    return new User();
    break ;
 case "Item":
    return new Item();
    break ;
 default:
    break ;
}

I think that It's not a clever  job. How to do it skillfully?

Thank you for any advice.

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