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check variable for whole dollar amount


Stooney

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What is the best way to go about this?  It is for a bidding system which only allows whole dollar amounts.  All I've come up with is settype() and is_int() but settype will change their bid to whole dollar, which is not what I want.  If they don't enter a valid amount, it needs to tell them to enter a valid amount, so we're never changing bids without people noticing.  Thanks in advance.

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