在PHP 5中，我可以动态地实例化一个类吗？

Is it possible to dynamically instantiate a class using a variable? For example is something like this possible in PHP?

class foo
{
    public $something;
}

$class_name = "foo";

$f = new $class_name();

That should work, yes.

You can also do:

$f = new $class($arg1,$arg2);

Yes, this code will work fine.

In PHP 5 can I instantiate a class dynamically?

Yes you can, your code should work fine.

Yes of course you can instantiate using dynamic names;