I wrote a recursive function, which returns an array with the paths to all files/folders in a given path. An array is already sorted and returns the exact information i want, but i struggle to display it properly in html lists. Array_of_paths = ( [0] => /path/to/folderA/ [1] => /path/to/folderA/subfolderAA/ [2] => /path/to/folderB/ [3] => /path/to/folderB/subfolderBB/ [4] => /path/to/folderB/subfolderBB/fileBB.txt [5] => /path/to/folderB/fileB.txt [6] => /path/to/folderC/ ... ) I want to put these paths in <ul>,<li> tags to see something like this: <ul> <li>/path/to/folderA/ <ul> <li>/path/to/folderA/folderAA/</li> </ul> </li> <li>/path/to/folderB <ul> <li>/path/to/folderB/subfolderBB/ <ul> <li>/path/to/folderB/subfolderBB/fileBB.txt</li> </ul> </li> <li>/path/to/folderB/fileB.txt</li> </ul> </li> <li>/path/to/folderC/</li> </ul> = /path/to/folderA/ /path/to/folderA/folderAA/ /path/to/folderB /path/to/folderB/subfolderBB/ /path/to/folderB/subfolderBB/fileBB.txt /path/to/folderB/fileB.txt /path/to/folderC/ I managed to find a couple of similars questions, but the answers were in Ruby language. So, what's the problem solving idea behind this?