Step 1. Gather requirements for the new system
Step 2. Does anything exist that already meets your needs? if so, stop here and buy it.
Step 3. Build a data model and screen designs.
Step 4. Does the new system jive with the stake holders expectations. Go back to step 1 if necessary.
Step 5. Code new site
If necessary, review various standard project templates (scrum, waterfall, whatever). Pick one and stick to it.
You'll notice a distinct lack of anything remotely related to "converting" the old code / data files to the new platform. This is to preserve your sanity and help ensure the project will be a success.
To answer the actual question: no. You might as well have asked if there were tools to convert a php site to java. They are radically different things with their own approaches.