Re: Simple question that I can't find the answer to
| From: | L Forrister | Date: | Sat, 13 Jan 2001 22:57:18 +0000 |
| Subject: | Re: Simple question that I can't find the answer to | ||
| References: | 1 2 3 | Groups: | php.windows |
| Request: | Send a blank email to php-windows+get-4986@lists.php.net to get a copy of this message | ||
All of these "tricks" to exchange the contents of two variables, while possessing a
certain elegance, share one common defect. They are tricky. Days, weeks and months later they can
and likely will be difficult to understand. This kind of trickiness may have a place deep in the
internals of a package such as PHP or an OS kernel, but in a routine to edit user inputs clarity is
probably a more important virtue. I suggest the best way to handle the situation originally posted
would be something like:
if $userFromDate > $userToDate {
$sqlFromDate = $userToDate;
$sqlToDate = $userFromDate;
}
else {
$sqlToDate = $userToDate;
$sqlFromDate = $userFromDate;
}
"Tricks" obviously do make interesting discussion topics though.
~~LF
----- Original Message -----
From: Sean Bright
To: php-windows@lists.php.net
Sent: Saturday, January 13, 2001 10:01 AM
Subject: Re: [PHP-WIN] Simple question that I can't find the answer to
Yeah, but you could run into overflow problems with large values of a
and b.
Sean
Jan Walter wrote:
>
> If you are working with numbers, which is perhaps not your case, you can use
> this simple trick to swith values of $a and $b:
>
> $a = $a + $b;
> $b = $a - $b;
> $a = $a - $b;
> --
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> LERACH, s.r.o.
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