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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 git.master, git.master_jit, rfc.property-hooks: 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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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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