Creating collapable/expandable trees in php

Title says most of it im wondering how i can create basic collapseable/expandable trees with php/mysql using mysql to fill in data. Im very new to php but i have a good coding background so if someone could give me an expample that would be great!
 
that one shows how to make the tree, to make it collapse and expand you need to add a little javascript, but that should be pretty easy.
 
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