RE: Explode-update-implode not working

["Bob McConnell" <rvm@xxxxxxxxx>]

Doh! I knew it would be something simple that I had overlooked. I recall reading that note last week and telling myself I would need to remember it. But that was then ...

Thank you, the code is working better now. I just wish I were.

Bob McConnell

-----Original Message-----
From: Andrew Ballard [mailto:aballard@xxxxxxxxx] 
Sent: Tuesday, June 23, 2009 12:25 PM
To: Bob McConnell
Cc: php-general@xxxxxxxxxxxxx
Subject: Re:  Explode-update-implode not working

On Tue, Jun 23, 2009 at 12:11 PM, Bob McConnell<rvm@xxxxxxxxx> wrote:
> At least not the way I expected it to. Apparently I am doing something
> wrong, but I can't find anything specific that explains it. This is in
> PHP 5.2.6.
>
> Here is the sequence I am trying to implement without the database
> portion. (This is typed in since the VNC I am using doesn't support
> pasting from a Linux client to a MS-Windows server.)
>
> -------------------------------------
> $buff = "key1|value1~key2|value2";
>
> $lines = explode ("~", $buff);
>
> foreach ($lines as $kvpair) {
>   $line = explode ("|", $kvpair);
>   if ($line[0] == "key1") {
>      $line[1] = "value3";
>      $kvpair = implode ("|", $line);
>      break;
>   }
> }
> $newbuff = implode ("~", $lines);
> -------------------------------------
>
> $kvpair is modified, but that change is ignored by implode() with
> $newbuff still containing "key1|value1".
>
> So why doesn't the change to $kvpair get brought in by implode? What
> should I do to update that value?
>
> Bob McConnell
>

See the second note at
http://www.php.net/manual/en/control-structures.foreach.php

Either of these should do what you want:

<?php
$buff = "key1|value1~key2|value2";

$lines = explode ("~", $buff);

foreach ($lines as &$kvpair) {
  $line = explode ("|", $kvpair);
  if ($line[0] == "key1") {
     $line[1] = "value3";
     $kvpair = implode ("|", $line);
     break;
  }
}
$newbuff = implode ("~", $lines);
?>

<?php
$buff = "key1|value1~key2|value2";

$lines = explode ("~", $buff);

foreach ($lines as $key => $kvpair) {
  $line = explode ("|", $kvpair);
  if ($line[0] == "key1") {
     $line[1] = "value3";
     $lines[$key] = implode ("|", $line);
     break;
  }
}
$newbuff = implode ("~", $lines);
?>


Andrew

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