Re: [PHP] I beleive I have found a bug..... From: * R&zE: (renze <email protected>)
Date: 08/29/01

<Original message>
From: Brian White <bwhite <email protected>>
Date: Wed, Aug 29, 2001 at 04:01:06PM +1000
Message-ID: <4.3.2.20010829154702.00b62910 <email protected>>
Subject: [PHP] I beleive I have found a bug.....

> ... I just thought I would see if anyone else can reproduce it!
>
> Ok. The problem is in the following snippet of code. ( Note : this exmaple
> is extremely contrived, and is the essence of a much more complicated
> situation involving a function call from a class method... )
>
> <?php
> $data = array( "A" => "AA" , "B" => "BB", "C"=> "CC", "D"=> "DD", "E"
> => "EE" );
>
> print "<pre>\n";
> foreach ( $data as $key1=>$val1 )
> {
> // foreach ( $data as $key2=>$val2 )
> foreach ( array_keys($data) as $key2 ) // <= PROBLEM IS HERE
> {
> if ( $key1 == $key2 )
> print "<b>$key2</b>";
> else
> print $key2;
>
> print " ";
> }
> print "\n";
> }
>
> print "</pre>";
> ?>
>
> I beleive it should generate
> <pre>
> <b>A</b> B C D E
> A <b>B</b> C D E
> A B <b>C</b> D E
> A B C <b>D</b> E
> A B C D <b>E</b>
> </pre>
>
> Instead it generates
> <pre>
> <b>A</b> B C D E
> </pre>
>
> If I replace the problem line
> foreach ( array_keys($data) as $key2 )
>
> with the alternate
> foreach ( $data as $key2=>$val2 )
>
> then it works fine.
>
> I am using PHP 4.0.4pl1.
>
>
> Regs
>
> Brian White
>
> -------------------------
> Brian White
> Step Two Designs Pty Ltd - SGML, XML & HTML Consultancy
> Phone: +612-93197901
> Web: http://www.steptwo.com.au/
> Email: bwhite <email protected>
>
>
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</Original message>

<Reply>

Hai Brain,

I don't _think_ this is a bug (note: think). I haven't taken a very
good look at your code, but as I understand you believe that:

  foreach ($data as $key)

delivers the same $key as in:

  foreach ($data as $key=>$value)

Well... it doesn't. Check the manual on it. If you use the
foreach ($x as $y) construction, $y is the value... not the key.
Take a look at:

http://www.php.net/manual/en/control-structures.foreach.php

<Quote from PHP manual>
foreach(array_expression as $value)
foreach(array_expression as $key => $value)
</Quote from PHP manual>

I think this solves your problem...

</Reply> 

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