hey, i gotta do this somehow but ive run out of ideas, maybe you can give me some examples or pseudocode or something?

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write class Tree, you can add menus like this:
$tree = new data_tree;
$tree->add(1, 0, 'Teine rida', 2);
$tree->add(2, 1, 'Teise rea alamrida', 1); 
$tree->add(3, 0, 'Esimene rida', 1); 
$tree->add(5, 1, 'Teise rea 2. alamrida', 2); 
$tree->add(9, 0, 'Viimane rida'); $tree->draw();

The params of add is $ID,$POSITION,$NAME,$ID_with_connected

So this should output:

Esimene rida 
Teine rida
- Teise rea alamrida
- Teise rea 2. alamrida
Viimane rida