How do I track decimal points in a textfield?

Anon

Hi again its me Raj,

I have taken up a big project in PHP and I'm a bit nervous about the fact that I'm not getting even the smallest calculations.

Problem:

Say , I have a Quantity textfield, it is to be typed in as how many quantities of the product the user wants.

I could able to check whether it is 'null' or '0' but if he fills in as 1.2 or .7 etc.

I need to track it and display an error message stating that 'Decimals are not allowed'.

How do I do it in PHP? Please help.

Appreciate all your help in advance.

Thanks & Regards,
Raj.

Anon

You can use a regular expression to see if they entered a decimal place:

if (eregi("..{1,}",$form_value) {
$errorMsg = "Quantity must be a whole number";
}

Of course you really only care that they entered in a valid integer, so you could just do this to see if all the characters are numeric and that there are not non numeric characters:

if (eregi("[^{0-9]{1,}",$form_value))} {
$errorMsg = "Quantity must be a valid whole number";
}

HTH

-- Rich Rijnders
-- Irvine, CA US

Anon

You could user regular expressions to check if all the characters entered are numbers.

Do a search through the forum, there have been excellent examples of how to check that a user entered a number or a word.

Anon

OR you could simply convert what they enter into a wholoe number using number_format like so:
if (is_int($str) || is_float($str)) {
print number_format($str, 0);
}
else {
print "this must be a number";
}

If they submitted 34 it would print 34
If they submitted 34.3452 it would print 34
If they submitted 34.6324 it would print 35
If they submitted billy it would print error message

Anon

Ah, but then the question is: which is faster? :-)