I am looking for any resources (but PHP mainly) that can be used to help validate BitCoin transactions, possibly for use with a Doubler or Multiplier service.

I am assuming the "simplest" method would be to just generate a new BitCoin receiving address for each Entry/Person and save those in a SQL database, then anything that is received by that address can be sent back to the Entry address tied to it.

I've already messed around with the API via PHP for awhile and messaged around with validating information via BlockExplorer, but that relies on a third-party service, and parsing the JSON data seemed a little messy for my tastes.