Description:
------------
Using PHP 5.3.6 on Mac OS X, I've found that hard-coding a class name into a 
script works fine, but attempting to create the same class using a string will not 
work, when relative namespaces are involved.

Test script:
---------------
<?php

namespace First\Second {
	class Test {
	}
}

namespace First {
	try {
		// This will work, as we're in First, so Second is relative.
		echo 'Creating hard-coded instance...', PHP_EOL;
		$instance = new Second\Test;
		echo 'Done.', PHP_EOL;
	} catch (Exception $e) {
		echo 'Failed!', PHP_EOL;
	}
	
	try {
		// This will *not* work, you have to use an absolute namespace like 'First\\Second\\Test'.
		echo 'Creating instance from string...', PHP_EOL;
		$class = 'Second\\Test';
		$instance = new $class;
		echo 'Done.', PHP_EOL;
	} catch (Exception $e) {
		echo 'Failed!', PHP_EOL;
	}
}

Expected result:
----------------
I'd expect the same results from either a string or a hard-coded class name.

Actual result:
--------------
PHP Fatal error:  Class 'Second\Test' not found