How to specify class dynamically in PHP?

Question

So normal class methods and object creation goes like this...

$obj = new Class();
$obj2 = Class::someMethod();

Can I instantiate "class" dynamically? How? I want to do something like...

$class = "Class";
$obj = new $class?;
$obj2 = $class?::someMethod();

Answer 1

$class = "Class";
$obj = new $class; // works
$obj2 = $class::someMethod(); // works as of PHP 5.3

// if you don't have PHP 5.3 and want to use the ladder:
$obj2 = call_user_func(array($class, 'someMethod'));

Answer 2

That should work without the ? in $obj = new $class?.