What about this:
build_url( 

      account => $account,
      fname   => $fname, 
      lname   => $lname],
);
sub build_url {
   my (%args) = @_;
   my $account = $args{account} || '';
   my $fname   = $args{fname}   || '';
   my $lname   = $args{lname}   || '';
   my $other   = $args{other}   ||'';

   ...
}

[download]

There, it should prevent it to be out of order right?

In reply to Re^3: Values passed into a sub routine by Anonymous Monk
in thread Values passed into a sub routine by Anonymous Monk

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