How to use jQuery SlickGrid with PHP / MySQL (load server data and save changes)

Please, in all the examples found in the SlickGrid code, the data array was randomly generated on the client side.

Getting: I need to know how to use PHP to fetch this information from a MySQL Database and return it using jQuery / AJAX to the SlickGrid.

Saving: I already found a link on StackOverflow for saving data from the grid using a hidden input (Saving changes in SlickGrid) but it's not really clear how I ought to handle this data on getting to the PHP script.

Some detailed help and/or pointers will be appreciated, I'm rather a noob and I did not find adequate documentation on this awesome plugin.