Dollars but NO Cents

partypete

Hello,

I've made up a small online auction but I've got one small problem. The user fills in a form with their info and their Bid amount, but for the bid I only want them to submit a dollar amount with numbers only. NO cents, no decimals, commas etc. I only want numbers from 0-9. A bid of 255 is good, but 255.50 is not.

So when the user submits the form, they go to a "Confirm Bid" page which shows the info and Bid they are about to submit. On this page I'd like to notify them if their Bid is incorrectly formatted and give them a chance to go back and fix it.

So on the confirm page I call the bid amount with:

<?php echo $bid_amount; ?>

Next to the bid amount I'd like to have "Invalid Bid - Please go back..." appear if the bid is not strictly numbers, and have nothing appear if the bid is fine. ie:

123.25 Invalid Bid - Please go back...
123

I think this code is what I'm supposed to be using but am not sure how to use it:

<?php if (preg_match('/[0-9]{3,4}/', $bid_amount){ 
   echo "Invalid Bid - Please go back..."; } ?>

Can you see what's wrong with this?

Thank you very much.

Peter

bad76

Hi,
i can see just a missing ) in if statement, and i think you need also a ! first:

 
<?php 
if (!preg_match('/[0-9]{3,4}/', $bid_amount))
  {  

   echo "Invalid Bid - Please go back..."; 
  } 
?>

partypete

Thanks for catching the errors, but the code must not be doing what I was hoping it would.

With the ! you added the script echo's nothing if 175 or 175.50 is submitted. Without the ! , "Invalid Bid -" is echoed for both 175 or 175.50.

I need nothing echoed if the Bid is pure numbers like 175, but an error echoed if the Bid is 175.XX .

Thanks for your help so far!

bad76

Yes, it's ok... you are asking to preg_match to find a string
with at least 3/4 digit. And 150.50 contain 150...

You have to limit with ^ and $:
if (!preg_match('/^\d{3,4}$/', $bid_amount)) //(\d means digit...)

I'm sorry for mistake, but with reg exp i'm a disaster 😃

partypete

Actually to make it simpler, I don't really even want to worry about how many digits their are because the form field will limit the user's input. So the previous code would I think look like this:

<?php  

if (!preg_match('/[0-9]/', $bid_amount)) 
  {   

   echo "Invalid Bid - Please go back...";  

  }  

?>

I think I've confused you a bit. Sorry :rolleyes: You're mentioning having to limit, but I don't think that'll do what I would like. I don't want to strip any characters or anything like that. I'm not trying to alter the information, I just want to indicate whether it's formatted correctly or not.

All I want the script to do is simply:

If $bid_amount contains ONLY Whole Numbers (absolutely nothing else, even decimals!) like 1 or 234 or 98374 or 883344 then ECHO Nothing.

If $bid_amount contains ANY characters that aren't a number from 1-9 then ECHO Invalid Bid.

I hope this clears up what I'm trying to do. Sorry if I'm making things complicated, or maybe it just seems complicated to me! 🙂

Thanks again,