There is no difference in using dynamic vs. lexical variables as parameters to a function. Assuming perl5.6 (or greater):

use strict;

sub foo {
    my $foo = shift;
    print $foo;
}

my $my_var   = "lexical bar";
our $our_var = "dynamic bar";

foo($my_var);
foo($our_var);
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However, using dynamic variables may cause strange results if not used with care. So using lexical variables is not a bad idea at all.

Using references to lexical and dynamic variables is just the same, except that you have to reference and dereference the variables.

But please note that if you're not careful enough using dynamic variables (those not declared with my), strange results can appear, so if you can, use lexical variables - that's probabely what you want anyway.

Autark.