well the code loads a file into an array line by line. However it certainly isn't the most optimal way to do this. At least I certainly wouldn't do it this way.

sub load_array($$)
    {
    #the first element we pass to this function is a 
    #array reference, the second is the name of a file
    my ($a_ref, $file) = @_;
    #attempt to open the file or quit executing our program
    open (FILE, $file) or die "Can't open $file:$!\n";
    #take all the lines in the file, and put them into the
    #array that $a_ref points to.
    @{$a_ref} = <FILE>;
    # close the file... duh I guess
    close FILE;
    # remove all of the carriage returns from the end of
    # each element in the array
    chomp @{$a_ref};
    }

# to call this routine
my @array;
&load_array(\@array, # pass in the reference to the array
            "test.txt"); # the name of our file
[download]

Personally I think I would rewrite this to do something like:

sub load_array {
    my $file = shift; # the first parameter is our file

    my @array;

    open(IN, $file) or die "Can't open $file: $!\n";
    # for every line in the file...
    while(<IN>) {
        chomp; # remove the trailing carriage return
        # could also be chomp $_;
        push @array; # put it into our array
        # could also be push @array, $_;
    } # while
    close(IN);

    return @array;
} # load_array

# to run this routine...
my @array = &load_array("test.txt");
[download]

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