The foreach statement works because you are getting the array index  
($k) to unset the array item. I think somewhere in the manual it says  
it's unsafe because some people might think you could just use unset 
($v) to unset the array item. Which wouldn't work because $v is more  
of a temporary variable and not a reference to the array item.

On Oct 27, 2005, at 6:18 PM, Richard Lynch wrote:

>  Somewhere in the manual (damned if I can find it now) it says (or used
>  to say) that you can or can't safely do this:
> 
>  while (list($k, $v) = each($array)){
>    if (...) unset($array[$k]);
>  }
> 
>  I don't even remember if it's safe or not, but I swear I saw it not
>  that long ago...
> 
>  Anyway, can you do *this* safely as a DOCUMENTED FEATURE:
> 
>  foreach($array as $k => $v){
>    if (...) unset($array[$k]);
>  }
> 
>  I'm sure I could test it and maybe find out if "it works" but is it
>  documented behaviour I can rely on?  I'm sure not finding this in the
>  manual now that I go looking for it, though I know I saw it there
>  before.
> 
>  PS
>  I'm being dragged kicking and screaming into using this new-fangled
>  'foreach' thing instead of while/list/each, and I don't really care
>  for it so far. :-)
> 
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