my @array1=qw(I like to eat tacos);
my @array2=qw(Do you like to eat burritoes);

my @diff = &get_diff(\@array1,\@array2);

sub get_diff(){

        my $slave = shift(@_);  # reference to @array1
        my $master = shift(@_);   # reference to @array2

        # loop through @master
        for (my $m = 0; $m < scalar(@$master); $m++){

                my $matchpos = 0;

                # loop through @slave
                for (my $s = 0; $s < scalar(@$slave); $s++){

                        # is this word found?
                        if (@$master[$m] eq @$slave[$s]){
                                $matchpos = $s;
                                last;
                        }
                }

                @diff = (@$master[$m],$m,$matchpos);
                print "@$master[$m],$m,$matchpos\n";

        }
}