package Foo;
use warnings;
use strict;

use Exporter qw(import);
our @EXPORT_OK = qw(function_or_method);
our %EXPORT_TAGS = (all => [@EXPORT_OK]);

sub new {
    return bless {}, shift;
}
sub function_or_method {
    # Throw away the first param if:
    # A) it's defined, and
    # B) it's either the class, or an object of the class

    if (defined $_[0]) {
        shift if $_[0] eq __PACKAGE__ || ref $_[0] eq __PACKAGE__;
    }

    # Now we grab the remaining params (if expecting any)

    my ($call_num, $call_type) = @_;

    print "Num: $call_num called as $call_type\n";

}

##</code><code>##

use warnings;
use strict;

use lib '.';
use Foo qw(:all);

# Call as function
function_or_method('1', 'function');

# Call as method
my $obj = Foo->new;
$obj->function_or_method('2', 'method');