If you really want this thing done and don't know what you're doing, try giving yourself 6 months. Or more. And a very long read through the PHP and MySQL documentation. And lots of posts to the php list when you can't figure things out.
You could also try outsourcing your code. If ALL you want is an exact copy in PHP, I bet there are plenty off off-shore (well, off the U.S. shore) companies willing to do it for a very reasonable rate. I can't speak for their design and how easy the code will be to work with, but that would be the way to do it fast and cheap (well, relatively cheap). But it better be important, because I bet it would be massively cheaper to buy another ColdFusion license than to try and re-implement ColdFusion in PHP on this scale!
Please post back here and let us know what happened with this. I'm guessing you posted feeling pretty freaked out after your boss pushed you to do this. Or perhaps you just thought that ColdFusion and PHP were very similar and there was some kind of converter or easy process, like going from GIF to PNG or something. Unfortunately, that's just not the case. If you come back and ask smaller, more specific questions, preferably somewhat pre-researched (just spend 3 minutes googling), we can help and we promise not to group-lynch you :)
-Galen
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