RE: [PHP] Re: Strange comparison behaviour
String "info" is converted to integer, which is 0...
a)
if("info" == "0")
b)
if("info" === 0)
c)
if("info" == (string)0)
Or use strcmp()
Cya...
Read a book "PHP for beginners"
-Original Message-
From: Bogdan Stancescu [mailto:[EMAIL PROTECTED]
Sent: Friday, May 13, 2005 5:13 AM
To: php-general@lists.php.net
Subject: [PHP] Re: Strange comparison behaviour
You probably mis-typed something:
[EMAIL PROTECTED] ~]$ php
Content-type: text/html
X-Powered-By: PHP/4.3.11
is 0
Cheers,
Bogdan
Erwin Kerk wrote:
> Hi All,
>
> Can anyone explain me why the following code:
>
> if ("info" == 0) echo "is 0\n"; else echo "not 0\n";
>
> Results in: not 0
>
>
> Whereas:
>
> if ("inf" == 0) echo "is 0\n"; else echo "not 0\n";
>
> Results in: is 0
>
>
>
> Notice the difference: info in the first sample, inf in the second sample.
>
>
> The used PHP version is PHP 4.1.2 (CLI version)
>
>
> Erwin Kerk
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Re: [PHP] Re: Strange comparison behaviour
On Fri, 2005-05-13 at 06:34, Erwin Kerk wrote:
> Bogdan Stancescu wrote:
> > You probably mis-typed something:
> >
> > [EMAIL PROTECTED] ~]$ php
> > > if ("info" == 0) echo "is 0\n"; else echo "not 0\n";
> > ?>
> > Content-type: text/html
> > X-Powered-By: PHP/4.3.11
> >
> > is 0
> Tried that, but notice the PHP Version, it is failing in PHP 4.1.2!
>
> Erwin Kerk
Same behavior on 5.x - I suspect something to do with the 'type' and
loose comparison operators. According to table 2:
http://us4.php.net/manual/en/types.comparisons.php is should evaluate as
true. Looking at the ordinal values revealed nothing to me...
';
echo ($string == 0) ? "is 0\n" : "not 0\n";
echo (rtrim($string, $lst) == 0) ? "is 0\n" : "not 0\n";
echo "---\n";
for($i=0; $i<$len; $i++) {
$ord_value = ord($string[$i]);
echo chr($ord_value) . "=" . $ord_value . "\n";
}
echo '';
?>
Anyway, I suspect using ($string === 0) will give you the expected
results.
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Re: [PHP] Re: Strange comparison behaviour
is upgrading your php out of the question? i would go with at least
4.3.x if not 5... unless you don't have root access on your server...
in which case, i have no advice...
On 5/13/05, Erwin Kerk <[EMAIL PROTECTED]> wrote:
> Bogdan Stancescu wrote:
> > You probably mis-typed something:
> >
> > [EMAIL PROTECTED] ~]$ php
> > > if ("info" == 0) echo "is 0\n"; else echo "not 0\n";
> > ?>
> > Content-type: text/html
> > X-Powered-By: PHP/4.3.11
> >
> > is 0
> Tried that, but notice the PHP Version, it is failing in PHP 4.1.2!
>
> Erwin Kerk
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>
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Re: [PHP] Re: Strange comparison behaviour
Bogdan Stancescu wrote: You probably mis-typed something: [EMAIL PROTECTED] ~]$ php Content-type: text/html X-Powered-By: PHP/4.3.11 is 0 Tried that, but notice the PHP Version, it is failing in PHP 4.1.2! Erwin Kerk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
