Next time, turn on strict and warnings. 
use strict;
use warnings;

package joe;
my @names = ('joe', 'aaron');

package FP;
sub sortNames ($$)
{
    my ($x, $y) = @_;
    print "$x vs $y\n";
    return $x cmp $y;
}

package joe;
my @sorted = sort {FP::sortNames($a,$b)} @names;

print "sorted : @sorted\n";

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My wife's blog

In reply to Re: sort sub in a different package by dragonchild
in thread sort sub in a different package by blahblahblah

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