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Re: Setting variable to false in a WHILE loop [message #175436 is a reply to message #175434]

Sat, 24 September 2011 13:14

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 9/23/2011 11:53 PM, jwcarlton wrote:
> I'm doing a MySQL query, then running a WHILE loop on it, like so:
>
> while (list($id, $title, $text) = mysql_fetch_row($sth)) {
> if ($text) {
> // do whatever
> }
> }
>
> The problem that I'm having is that sometimes, it's possible for $text
> to equal "" instead of NULL. I use it as a quick way to check whether
> the row is new (in which case $text is NULL), or if it's been updated
> (in which case $text is ""), without requiring an additional field.
>
> I know that I could just say:
>
> if ($text&& ($text != "")) {
>
> And I could move the list() inside of the loop, like so:
>
> while ($row = mysql_fetch_row($sth) {
> $text = false;
> list($id, $title, $text) = $row;
>
> if ($text) {
> // do whatever
> }
> }
>
>
> But I'm curious if there's a way to reset $id, $title, and $text to
> false at the beginning of the loop. Something like:
>
> // Just a mock-up, using "my" from Perl
> while (my(list($id, $title, $text)) = mysql_fetch_row($sth)) {
>

Why complicate things? Why not just use

if ($text !== false)

--
==================
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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[Message index]

		Setting variable to false in a WHILE loop By: jwcarlton on Sat, 24 September 2011 03:53
		Re: Setting variable to false in a WHILE loop By: Jerry Stuckle on Sat, 24 September 2011 13:14
		Re: Setting variable to false in a WHILE loop By: tamouse on Wed, 28 September 2011 18:28
		Re: Setting variable to false in a WHILE loop By: Tim Streater on Wed, 28 September 2011 19:49
		Re: Setting variable to false in a WHILE loop By: Doug Miller on Thu, 29 September 2011 12:09
		Re: Setting variable to false in a WHILE loop By: Thomas 'PointedEars' on Sat, 01 October 2011 14:08

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