On 23 October 2010 16:48, Jonathan Sachs <081012@xxxxxxxxxxx> wrote:
> On Sat, 23 Oct 2010 08:34:27 +0200, peter.e.lind@xxxxxxxxx (Peter
> Lind) wrote:
>
>>It is not a bug - somewhere before the foreach loop you've got, a
>>variable is being referenced, and that's throwing things off.
>>Otherwise, unsetting the variable would have no effect on the problem
>>you're seeing.
>
> Could you please be more specific? "Somewhere... a variable is being
> referenced" doesn't give me any insight into what is happening.
>
> It's absolutely clear to me WHERE the problem is. The first foreach
> loop is causing the problem; I can prove this by removing it. But WHAT
> the problem is, is absolutely unclear. I've studied this code every
> which way, and I don't see how the first foreach loop can possibly
> make the second one change the array -- unless it's a bug.
>
> I've boiled the script down to a couple of dozen lines that
> demonstrate the problem without references to a database or to other
> scripts. Having this to play with may help others give me some
> insight.
>
>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> <html>
> <head> <title>foreach problem</title> </head>
> <body>
>
> <?php
> Â $qs = array();
> Â for ($i=0; $i<3; ++$i) {
> Â Â Â$qs[] = array($i);
> Â }
>
> Â foreach ($qs as &$q) {
> Â }
>
> Â echo $qs[0][0] . $qs[1][0] . $qs[2][0] . "<br>";
>
> Â foreach ( $qs as $q ) {
> Â Â Âecho $qs[0][0] . $qs[1][0] . $qs[2][0] . "<br>";
> Â }
>
> Â echo $qs[0][0] . $qs[1][0] . $qs[2][0] . "<br>";
> ?>
>
> </body>
> </html>
>
You should read
http://dk2.php.net/manual/en/control-structures.foreach.php - it
points out the problem you're facing.
More information (and a complete breakdown of your problem) is
available here:
http://schlueters.de/blog/archives/141-References-and-foreach.html
It's not a bug - it's the effect you get when using references.
Regards
Peter
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