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reduce POST value by 75

Posted on 2008-09-30
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Last Modified: 2012-05-05
Hello,

In the below code I am checking if a post value exists, if it does I want to reduce that amount by 75.00, is teh code below correct?

Thank you.
if (isset($_POST['amount']))
	{
	$_POST['amount']= ($_POST['amount']-'75.00');
	}

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Question by:vrmetro
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6 Comments
 
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Expert Comment

by:Ray Paseur
ID: 22606360
You should remove the quotes from '75.00'
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Accepted Solution

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Ray Paseur earned 500 total points
ID: 22606407
I might do something like this.  What edits you would do would depend on what final values are acceptable for your application.
if (isset($_POST['amount']))
{
        $amount	= trim(ereg_replace("[^0-9\.\-]", "", $_POST['amount']));
        $amount = $amount - 75.00;
        $_POST['amount']= $amount; // OR JUST USE $AMOUNT
}

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Author Comment

by:vrmetro
ID: 22606687
What does this part do?

ereg_replace("[^0-9\.\-]",
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Author Closing Comment

by:vrmetro
ID: 31501584
what does ereg_replace("[^0-9\.\-]",  do?
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LVL 110

Expert Comment

by:Ray Paseur
ID: 22606978
Hi,vrmetro:Thanks for the points!  That ereg statement discards everything except the numerals, the decimal point and the minus sign.  You would not get a meaningful answer if $_POST had "$79.00" in the field - unless you made some edits to control for the kind of data that work with arithmetic. ~Ray
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Author Comment

by:vrmetro
ID: 22607536
thanks Ray, much appreciated.
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