Re: how to say "inverse your value" (to a boolean)?
| From: | Martin Scotta | Date: | Tue, 11 Aug 2009 00:39:10 +0000 |
| Subject: | Re: how to say "inverse your value" (to a boolean)? | ||
| References: | 1 2 3 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-296590@lists.php.net to get a copy of this message | ||
Use...
$dr = !$dr
if you want....
Notice: Undefined variable: dr
All variables MUST be initialized before using.
If you PHP does not complains about it you should read about error_reporting
On Mon, Aug 10, 2009 at 8:18 PM, Daevid Vincent <daevid@daevid.com> wrote:
> NO! For the love of God and all that is holy, don't do that accumulator /
> mod "hack".
> That's sooooo 1980's. And why make the CPU do all that math for every
> row...
>
> Just do this. It's quick and simple:
>
> CSS:
> .dataRow1 { background-color: #DFDFDF; }
> .dataRow2 { background-color: #FFFFFF; }
>
> foreach ($foo_array as $foo) {
> ?><tr class="<?= ($dr = !$dr) ? "dataRow1" : "dataRow2"
> ?>"><td><?= $foo
> ?></td></tr><?php
> }
>
> No need to initialize $dr as by default PHP will make it a boolean "false",
> then each itteration, it will toggle true/false and substitute the CSS
> class
>
> > -----Original Message-----
> > From: Jim Lucas [mailto:lists@cmsws.com]
> > Sent: Monday, August 10, 2009 4:03 PM
> > To: John Butler
> > Cc: PHP-General List
> > Subject: Re: [PHP] how to say "inverse your value" (to a boolean)?
> >
> > John Butler wrote:
> > > quick Q:
> > > I have this inside a foreach{} that I want to alternate
> > between on and
> > > off so I can alternate the background-color of my <tr>'s.
> > >
> > > $tableRowBGcolorBoolCounter != $tableRowBGcolorBoolCounter;
> > //-boolean
> > > on and off
> > >
> > > I am looking thru' docs and books, but can't remember (nor
> > find now) in
> > > PHP how to say "inverse your value" (to a boolean).
> > > ?
> > >
> > > TIA! -G
> > >
> > >
> >
> > <?php
> >
> > $arr = range(1, 10);
> >
> > $i = 0;
> > foreach ( $arr AS $row ) {
> >
> > $row_color = ( ( $i++ % 2 ) ? 'green' : 'red');
> >
> > echo $row_color;
> >
> > }
> >
> > ?>
> >
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
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> >
>
>
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--
Martin Scotta