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I guess its a stupid question I'm asking, but, does it have to be PHP? I'm making a wee assumption you want it dumped into mySQL.
If that's the case - then FDSE can do that.
If it's not....I'm on the same hunt as you....well...I will need something along the same lines.
If nothing is found I'll no doubt have to pay someone to make one.......will be stickying jatar_k if he has the time ;)
Thank God Google know what is FDSE.
I decided to make something similar in PHP, so it can save me time. I don't want the pages indexed - just the site structure.