last exit the current loop ( in your case the while loop ). if you like to exit all loops and continue at with the next entry on the for loop lable that. 
...
loop: foreach ( @arr_vars ){
  while( (my $key, my $value) = each %mapped_vars){
  ...
  if ( $_ eq $key ) {
    ...
    next loop;
  }
}

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Boris

In reply to Re: How to use 'last' / 'next' commands to exit loop? by borisz
in thread How to use 'last' / 'next' commands to exit loop? by sara2005

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