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@ 2019-04-19T07:19:01Z

<?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,
        );

$year = 2019;
$sums = array();
for ($i = 1; $i <= 12; $i++) {
    $sum = 0;
    for ($j = $i - 5; $j <= $i; $j++) {
        $y = $year;
        $m = $j;
        if ($m <= 0) {
            $m += 12;
            $y -= 1;
        }
        $date = sprintf("date_%4d_%02d", $y, $m);
        $sum += $array[$date];
    }
    $date = sprintf("date_%4d_%02d", $year, $i);
    $sums[$date] = $sum;
}
print_r($sums);

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 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 ( [date_2019_01] => 25 [date_2019_02] => 20 [date_2019_03] => 16 [date_2019_04] => 13 [date_2019_05] => 11 [date_2019_06] => 10 [date_2019_07] => 0 [date_2019_08] => 0 [date_2019_09] => 0 [date_2019_10] => 0 [date_2019_11] => 0 [date_2019_12] => 0 )

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