my %hash;
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But careful with mixed data structures and the risk of accidental symbolic references. strict can catch that.

An example:

my %hash;
$hash{beta} = 'x';
for my $name ( qw(alpha beta) ) {
    push @{$hash{$name}}, 123, 456;
}

use Data::Dumper;
print Dumper \%hash;
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Result:

$VAR1 = {
          'alpha' => [
                       123,
                       456
                     ],
          'beta' => 'x'
        };
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So... where's the array data for 'beta'? It's in the global variable @x. Witness: append this line to the above script:

print Dumper \@x;
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Result:

$VAR1 = [
          123,
          456
        ];
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With strict enabled, it'll get caught while trying to push the data: insert the line

use strict;
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at the top of the script and comment out the line, dumping @x, we appended earlier:

Can't use string ("x") as an ARRAY ref while "strict refs" in use at t
+est.pl line 6.
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Nasty if you didn't expect it.

The risk of running into it is greatest when using data structures of unequal depth.

John

#!/user/bin/env perl

use strict;
use warnings;
use Data::Dumper;

my %hash = (); 
my $key = 'A';
my $insert_value = 123;
push(@{$hash{$key}},$insert_value);

print Dumper(\%hash);
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$VAR1 = {
          'A' => [
                   123
                 ]
        };
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You wrote

(I picked this off of: http://www.perlmonks.org/?node_id=1977)

  I picked this up [1977|here].<br>
  I picked this up from [How do I make a hash of arrays?]
[download]

I picked this up here.
I picked this up from How do I make a hash of arrays?