Question

I don’t know if this is possible with the current DB schema, but here goes. I have main categories, these are simply marked with a boolean value in the DB. Then there is a comma-delimited list of subcategories.

For example:

MainCat1
    SubCat1
        SubCat2
        SubCat2-1
            Subcat3

So in MainCat1’s subcategory field there would simply be “SubCat1” and in SubCat1’s subcategory field there would be “SubCat2, SubCat2-1” and so forth.

I hope that makes sense! I don’t mind how you show it, they will eventually be nested lists.

DB Schema:

id        |maincat  |       subcats     |
---+---------+--------------------------+
MainCat1  |    1    |SubCat1            |
SubCat1   |    0    |SubCat2, SubCat2-1 |
SubCat2   |    0    |                   |
SubCat2-1 |    0    |SubCat3            |
SubCat3   |    0    |                   |

Answer 1

You can create sublevels:

MainCat1             // sublevel = 0
    SubCat1          // sublevel = 1
        SubCat2      // sublevel = 2
        SubCat2-1    // sublevel = 2
            Subcat3  // sublevel = 3

You can use arraykeys to set the sublevel:

$menu[0][0] = 'MainCat1';
$menu[1][0] = 'SubCat1';
$menu[2][0] = 'SubCat2';
$menu[2][1] = 'SubCat2-1';
$menu[3][0] = 'Subcat3';