如何在PHP中动态指定类？

Question

所以正常的类方法和对象创建就像这样......

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

我可以动态实例化“class”吗？怎么样？我想做点什么...

$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

?中没有 $obj = new $class?的应该有效。