NYCPHP Meetup

[Cliff Hirsch]

Has anyone tried the PECL input filter extension? Might help.

http://pecl.php.net/package/filter

-----Original Message-----
From: talk-bounces at lists.nyphp.org [mailto:talk-bounces at lists.nyphp.org]
On Behalf Of Hans Zaunere
Sent: Friday, December 02, 2005 12:18 PM
To: 'NYPHP Talk'
Subject: Re: [nycphp-talk] ctype_digit in PHP 5.1.x




Scott Mattocks wrote on Friday, December 02, 2005 11:33 AM:
> Chris Shiflett wrote:
> > Scott Mattocks wrote:
> > > Anyway, the problem is with ctype_digit returning true for null 
> > > strings.
> > 
> > There is no such thing as a null string, because null is not a 
> > string. I think you mean the empty string, based on your example:
> 
> Yes. I meant empty string. Sorry.

Script and output...

$TheString = '';

echo 'Empty String: ';
var_dump(ctype_digit($TheString));

$TheString = NULL;

echo 'NULL: ';
var_dump(ctype_digit($TheString));


----Output

Empty String: bool(false)
NULL: bool(false)


> > Why would this be considered a bug?
> > 
> > The ctype_digit() function returns true if every character in a 
> > string is a digit. The length of the string seems like a separate 
> > criterion.
> 
> It would be a bug because it doesn't function as one would expect. The

> manual says, " Returns TRUE if every character in text is a decimal 
> digit, FALSE otherwise." Since there are no characters, they cannot be

> decimal digits. Therefore, I would expect the "FALSE otherwise" to 
> kick in. If it said, "Returns FALSE if the string contains non-decimal

> characters" I might agree with you. It may just be semantics, but do 
> you really expect ctype_digit('') to return TRUE?
> 
> Anyway, I decided not to be such a dummy and just downloaded the 
> Windows version. In 5.1.1 (on Windows at least), ctype_digit('') 
> returns false.

So yeah, it appears to be as expected now.  However, ctype_digit() is
really just a wrapper around the native C functions, so the setlocale()
and family of libs are something to consider.  The above script I did
produces the same output on Fedora and Windows, but man setlocale and
man isdigit could also cover it.


---
Hans Zaunere / President / New York PHP
   www.nyphp.org  /  www.nyphp.com



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