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@ 2019-04-19T07:53:00Z

<?php

$array = array(
                "date_2019_12" => 0,
                "date_2019_11" => 0,
                "date_2019_10" => 0,
                "date_2019_09" => 0,
                "date_2019_08" => 0,
                "date_2019_07" => 0,
                "date_2019_06" => 0,
                "date_2019_05" => 0,
                "date_2019_04" => 0,
                "date_2019_03" => 0,
                "date_2019_02" => 0,
                "date_2019_01" => 10,
                "date_2018_12" => 1,
                "date_2018_11" => 2,
                "date_2018_10" => 3,
                "date_2018_09" => 4,
                "date_2018_08" => 5,
                "date_2018_07" => 6,
        );

    krsort($array);

    $year = "2019";
    $keys = array_keys($array);
    foreach(array_values($array) as $k => $v){
        if(strpos($keys[$k], $year) !== false) $res[$keys[$k]] = array_sum(array_slice($array, $k, 6)); 
    }
    var_dump($res);

Output for 7.1.25 - 7.1.28, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.33, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9: array(12) { ["date_2019_12"]=> int(0) ["date_2019_11"]=> int(0) ["date_2019_10"]=> int(0) ["date_2019_09"]=> int(0) ["date_2019_08"]=> int(0) ["date_2019_07"]=> int(0) ["date_2019_06"]=> int(10) ["date_2019_05"]=> int(11) ["date_2019_04"]=> int(13) ["date_2019_03"]=> int(16) ["date_2019_02"]=> int(20) ["date_2019_01"]=> int(25) }

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