[ic] Little puzzle for Perl gurus

[interchange-users@icdevgroup.org (marc.brevoort)]

Hello,

Sorry, this is more of a Perl issue than Interchange, 
but I'm stumped here. 

The following gives me the result I expected:

##########################################
sub do_order_action { 
        my $page="";

        my ($ordernumber,$orderline,%subref,%CGI)=@_;
        my @keysar=keys %subref;
        foreach my $ky (@keysar) {$page.=$ky;}

        my $comment=$CGI->{"comment_$orderline"};
        return $page."... subref{hello}=$subref{hello}, comment=$comment";
}

do_order_action($CGI->{order},$line,%ref2sub,%CGI);
##########################################

Output of the function is:

pending_cancelledpending_packingpending_backorderbyehello... 
ref2sub{hello}=CODE(0x92837ac), comment=

After swapping the last two subroutine parameters both
in the sub and the call to it, the function outputs:

... ref2sub{hello}=, comment=   

##########################################
sub do_order_action { 
        my $page="";

        my ($ordernumber,$orderline,%CGI,%subref)=@_;
        my @keysar=keys %subref;
        foreach my $ky (@keysar) {$page.=$ky;}

        my $comment=$CGI->{"comment_$orderline"};
        return $page."... subref{hello}=$subref{hello}, comment=$comment";
}

do_order_action($CGI->{order},$line,%CGI,%ref2sub);
##########################################

Although things seem to work OK in the first version, 
I think it's a bit creepy to not understand why swapping 
the parameters makes a difference. What am I missing?

Regards,

Marc Brevoort