Description:
------------
After registerPHPFunctions in XSLT, you can't use the scope 
resolution operator (::) to call a method within a class.

I.e. (this used to work <5.1.2):
"If you wish to use a function from inside a class use the 
double colon (::) notation, for example;

php:functionString('classname::function')

The funtion is fired off as a static and as such acts like a 
function in the global namespace." from [http://fr.php.net/
manual/en/function.xsl-xsltprocessor-register-php-
functions.php] 

This no longer works and will throw the following error 
Unable to call handler classname::function

I'm not sure what the real value of this functionality was 
anyway and have worked around this in my code, but it was 
avalible in previous versions.