使用 PHP 5.3 命名空间按字符串实例化类

我无法解决使用字符串变量和 PHP 5.3 实例化新类的问题.命名空间.例如，这是有效的；

I can't get around an issue instantiating a new class by using a string variable and PHP 5.3. namespaces. For example, this works;

$class = 'Reflection';
$object = new $class();

然而，这不是；

$class = 'ApplicationLogMyClass';
$object = new $class();

抛出一个致命错误，说明找不到该类.然而，如果使用 FQN，它显然可以被实例化，即；

A fatal error gets thrown stating the class cannot be found. However it obviously can be instantiated if using the FQN i.e.;

$object = new ApplicationLogMyClass;

我发现这在 PHP 5.3.2-1 上是显而易见的，但在更高版本中则不然.有没有办法解决这个问题?

I've found this to be aparrent on PHP 5.3.2-1 but not not in later versions. Is there a work around for this?