Depth-first search maze generation in PHP

I'm looking for a very simple implementation of the Depth-first search random maze generation algorithm. I'm trying to get my head around it, but i just can't understand the neighbor identification part.

http://en.wikipedia.org/wiki/Maze_generation_algorithm#Depth-first_search

Maybe someone can provide a simple snippet? :)

What do you mean, "the neighbor identification part"? If you're at (x,y), the neighbors are (x-1,y), (x,y-1), (x+1,y) and (x,y+1).

You want to randomly select an edge (Wall) from a vertex. Each vertex has 4 edges (North, South, West, East). First off you want to build a tree with all vertex IMO in Zig-Zag order?