3 billion? im pretty certain ive gotten it up to like 100+ places and i just stopped trying to get any higher. It is possible that the exact max is specified by your mysql server settings for the signed DOUBLE datatype.
I think the only way to allow upwardly more is to require you to have a arbitrary precision math module installed with your php, but thats server intensive and personally unncessary - i recommend that you consider scaling your award/cost amounts down a bit instead.
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