php virtual table

Works out of the box, but can also be easily integrated with more complex e-commerce solutions.

It is highly flexible and simple to administrate.

If needed, it can export cart data to a CSV file.

What is new in this release:

• Interface and abstract class added
• Redundant functions are deleted
• No need to set column number or create_table or to check with is_new() function
• All memory functions are made private
• Declaration codes become simpler
• VirTable::usage() shows only public function list