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Stopping negative numbers
Posted: Wed Feb 12, 2003 5:29 am
by megaming
Hi,
How do I stop users sending negative numbers to my database from a form?
I don't want to do this with javascript because that can easily be turned off.
Thanks

Posted: Wed Feb 12, 2003 5:32 am
by twigletmac
You can do a test on the form processing page that checks to see if a number is greater than zero:
Code: Select all
if ($_POST['number'] >= 0){
echo 'Positive Number';
} else {
echo 'Negative Number';
}
Mac
Posted: Wed Feb 12, 2003 5:33 am
by megaming
I've already got that, but it doesn't work...
Code: Select all
if ($newgold < "0") {
print "You do not have that much!";
}
if ($newgold > "0") {
// do db stuff
}
Posted: Wed Feb 12, 2003 5:40 am
by twigletmac
Have you tried something like:
Code: Select all
if ($_POST['newgold'] < 0) {
echo 'You do not have that much!';
} else {
// do db stuff
}
Mac
Posted: Wed Feb 12, 2003 5:46 am
by megaming
is there actually any difference?
Posted: Wed Feb 12, 2003 5:54 am
by twigletmac
Yes - first of all it uses the $_POST array to reference the variable just in case the problem is one caused by register_globals:
viewtopic.php?t=511
Secondly instead of using two if statements it uses one if...else statement which makes more sense as you can first test if the variable is less than 0 (ie. negative) and then if it's not the default stuff in the else statement is done.
Mac