I may be missed the obvious, but when often find functions not listed on the function guide, such as printlatestimages. Is this because it is an old reference? Is there any place to get a complete guide?

Unfortunately it is often a quesion of knowing where to look. The functions guide is generated and organized by script module. Maybe there is a way to get an alphabetical listing out of the generator of all functions--acrylian will need to address that, he is master of the documents.

In the case of the function you are looking for, it is part of the image_album_statistics plugin. Therefore it is listed in the plugins section under that module. http://www.zenphoto.org/documentation/plugins/_plugins---image_album_statistics.php.html

Perhaps the easiest way to find the documents for a specific function is to run a search on the zenphoto source for that function name. The documentation is all in the source code--that is where the document software extracts it.

There is already an alphabetical list of all functions (and variables) included. Just click on "all elements" link in the upper right corner on the documentation.