Hello vels, and welcome to the Monastery!

Here is some simple code to create a 3D array, pass it into and out of a subroutine, and print it using the module Data::Dump:

#! perl
use strict;
use warnings;
use Data::Dump;

my @array3d =
(
    [
        [ 'a', 'c', 'e', ],
        [ 'f', 'h', 'j', ],
        [ 'k', 'm', 'o', ],
    ],
    [
        [ 'A', 'C', 'E', ],
        [ 'F', 'H', 'J', ],
        [ 'K', 'M', 'O', ],
    ],
);

dd \@array3d;
my $array_ref = multi(\@array3d);
dd $array_ref;
print "$array_ref->[0][2][1]\n";
       $array_ref->[0][2][1] = 'Change 2';
dd $array_ref;

sub multi
{
    my ($array3d_ref) = @_;

    $array3d_ref->[1][1][2] = 'Change 1';

    return $array3d_ref;
}
[download]

Output:

13:12 >perl 749_SoPW.pl
[
  [["a", "c", "e"], ["f", "h", "j"], ["k", "m", "o"]],
  [["A", "C", "E"], ["F", "H", "J"], ["K", "M", "O"]],
]
[
  [["a", "c", "e"], ["f", "h", "j"], ["k", "m", "o"]],
  [["A", "C", "E"], ["F", "H", "Change 1"], ["K", "M", "O"]],
]
m
[
  [["a", "c", "e"], ["f", "h", "j"], ["k", "Change 2", "o"]],
  [["A", "C", "E"], ["F", "H", "Change 1"], ["K", "M", "O"]],
]

13:12 >
[download]

Note the -> in the expression $array3d_ref->[1][1][2]. This is required; see:

• perlreftut
• perlref
• perldsc
• intro to references
• Arrays and hashes only with references

Also, please put your code within <code> ... </code> tags, as this makes it easier for the monks to read.

Hope that helps,