Why the following code does not process elements added inside the loop ...

Consider that 

  foreach ( sort keys %h ) {
      ...
      $h{$new} = $new;

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is equivalent to 
  @sorted = sort keys %h;
  foreach ( @sorted ) {
      ...
     $h{$new} = $new;

[download]
The keys have been extracted from the hash before being sorted and processed. Any keys you add after that aren't "visible" to the foreach.

By the way, the "next;" is redundant.

In reply to Re: foreach loop question by dws
in thread foreach loop question by dda

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