JQuery - Group Checkboxes

I have the following code which expands and collapses a subcategory when the arrow image is clicked.
Category - Fruits
Category - Vegetables
Category - Dessert
Note that when the form is posted, I get the following output [chk0] => Array ( [0] => true [1] => true ) ..... ....... How can I make sure I get the posted values like this: [chk0] => Array ( [0] => true [2] => true ) The idea is to modify the JavaScript functions and HTML code so the checkbox toggling works and also the POSTED values contain the keys of the checked checkboxes instead of sequential values. How can I do this?

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