Why does the use of the CommunityQuestionComment object produce errors in CPHP?
Connect for PHP (CPHP) API
There is no CPHP CommunityQuestionComment object type. Rather the appropriate name is CommunityComment (version 1.4), and SocialQuestionComment (versions 1.2 and 1.3). This issue is being addressed in the product feature documentation.
The current API documentation for this object is here.