Before trying to print @arr, I think you should learn how print what you call @subArr.

I changed the terminology a bit below. I called @subArr, @href_array, array of hash references.

#!/usr/bin/perl
use strict;
use warnings;

my @href_array;  #array of ref's to hash
my @arr;         #an array of ref's to @href_array arrays

my %hash  = ();
my %hash2 = ();
my %hash4 = ();
my %hash8 = ();


$hash{key} = 12;
$hash{pl}  = 1;
$hash{lop} = 9;

$hash2{key} = 88; #changed this to be different
                  #than $hash{key} = 12

$hash4{pl}  = 1;

$hash8{lo}  = 9;

push(@href_array, \%hash);  #array of ref's to hash
push(@href_array, \%hash2); #array of ref's to hash
push(@href_array, \%hash4); #array of ref's to hash
push(@href_array, \%hash8); #array of ref's to hash


dump_hashref_array (@href_array);


sub dump_hashref_array  # dump_hashes(\%h1,\%h2,...,\%hn)
{
   my @hrefs = @_;
   
   my $n_table =1;
   foreach my $href (@hrefs)
   {
      print "dumping hash table ", $n_table++,"\n";
      
      foreach my $key (keys %$href)
      {
         print "$key=>$href->{$key}\n";
      }
      print "\n"; #just a spacer line between hashes
   }
}

__END__
PRINTS:
dumping hash table 1
key=>12
pl=>1
lop=>9

dumping hash table 2
key=>88

dumping hash table 3
pl=>1

dumping hash table 4
lo=>9
[download]

Update: Note that push(@arr, \@href_array); would mean that @arr is an array of references to @href_array. This would add one more foreach() level to the code. I recommend study of the above before trying to add yet another level to the data structure.

A bit off topic, but I see you are flummoxed by this "1/8" sometimes result? This is kind of a weird thing, but here is how it could happen. A reference to hash could also result from different code. Anyway this is how you could get the string "1/8":

#!/usr/bin/perl
use strict;
use warnings;

my %hash;
$hash{anything} =1;

my $hash_result = %hash;

print "scalar value of a this hash = $hash_result\n";

__END__
PRINTS:
scalar value of a this hash = 1/8

# scalar values of a hash is a string, like "1/8"

# Means that 1 of 8 hash buckets is currently in use.
# A Perl hash always starts with 8 hash buckets.
#
# Perl will double the number of hash buckets as it
# sees fit. You have no control over that decision.
#
# Current versions of Perl have some randomization of
# the keys -- a run with the exact same data may
# result in a difference in # of keys used or total keys.

# Of course the code above will always result in "1/8".
[download]

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