The json_decode in PHP there looks like the same thing as decode_json in the JSON (or JSON::XS) module in perl. Note, however, that PHP is kinda lying to you - key-value pairs are stored in maps or, in perl, hashes. That PHP doesn't differentiate may make PHP easier, but makes translating what you've learned in PHP to other languages harder. (To be fair, translating from Perl to, say, C++, isn't trivial, either, for similar abstraction-based reasons.)

Presumably, that get_object_vars function exists elsewhere in the code, though your printouts make it look like it doesn't do anything, as $value1 already will have that value by way of the decode_json function. So, a rough copy would be:

#!/usr/bin/perl

use JSON;

my %data;

while (<DATA>)
{
    my ($key, $value) = split ' ', $_;
    $value = decode_json($value);

    if (exists $data{$key})
    {
        while (my ($k,$v) = each %{$value[1]})
        {
            $data{$key}{$k} += $v;
        }
    }
    else
    {
        $data{$key} = $value;
    }
}

use Data::Dumper qw(Dumper);
print Dumper(\%data);


__END__
36dc0d7d0ac25ce60898c36ca135fbbd    [[12051,840,501,33],{"23602":22}]
4c38528ffe96a15c90e8cfcaaad048e3    [[13308,124,-1,62],{"8002":12}]
5557a6bed3793133754d288e2b58763a    [[2197,840,751,6],{"16501":1}]
5a9c1f69434c1a8b1d7880ef03ae4264    [[7525,616,-1,14347],{"24902":37}]
87f63173118df680a4c1d63b7953faf3    [[2765,458,-1,11937],{"3102":15}]
901d1a5dbd4ed87fd68db2513fb29762    [[1828,124,-1,63],{"8002":379}]
c23a2b2c10af8af96b1b24ddd4cc53d4    [[62,840,820,38],{"16801":303}]
d7af9cd8573ecbec6d42e453439e3e0f    [[4680,124,-1,63],{"1012":1896}]
d93adab6b345608d38ea84811012dce8    [[114,840,819,48],{"22502":322,"80
+02":3}]
ffd50dd8b4986f40634d6b5925dc04c6    [[6089,840,803,5],{"1252":1}]
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