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@ 2020-10-06T09:39:12Z

<?php

$json = '  [
                {
                    "id": "11",
                    "from_userid": "1996",
                    "contest_id": "29",
                    "to_userid": "8",
                    "vote_date": "2020-10-06 01:40:04",
                    "count_votes": "1"
                },
                {
                    "id": "1",
                    "from_userid": "82",
                    "contest_id": "29",
                    "to_userid": "94",
                    "vote_date": "2020-09-03 07:06:36",
                    "count_votes": "1"
                },
               {
                    "id": "2",
                    "from_userid": "82",
                    "contest_id": "29",
                    "to_userid": "98",
                    "vote_date": "2020-09-03 07:06:36",
                    "count_votes": "0"
                }
            ]';
            
$arr = json_decode($json, true);

$max = max(array_column($arr, 'count_votes'));
$out = array_filter($arr, function ($o) use ($max) {
    return $o['count_votes'] == $max;
});
print_r($out);

json_decode: documentation ( source)
array_column: documentation ( source)
print_r: documentation ( source)
array_filter: documentation ( source)
max: documentation ( source)

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