I just noticed that a bunch of nameless functions are used in SFI_Inputs.php, which will cause errors for everyone that doesn't have PHP >=5.3. I guess this is something that was not intentional, so is a bug...
Version: unspecified
Severity: major
URL: http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/SemanticFormsInputs/SFI_Inputs.php?view=markup