title: Multi-Level Bullets Implementation
body: <p>What is the best way of implementing multi-level lists/bullets in php? </p>
  
  <p>What I'm trying to implement is a system to take in short phrases, and categorize them within sections. However, at the same time, I would like to have each section to be collapsible and capable of having sub-sections within them.</p>
  
  <p>For Example:
  Section 10<br>
  Section 10.X<br>
  Section 10.X.X<br></p>
  
  <p>I was thinking of having each sub-layer as an array, but I realize that I've seen the same type of collapsibility in many places, and they all seem to be similar. Maybe there already is a package or library that does this? And if there is, how should my data-structure for keeping each entry be structured?</p>