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@ 2019-04-19T07:26:31Z

<?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);
        
        
        $newArr = array();
        foreach($array as $key => $val) {
            $i=1;
            $newArr[$key] = $val;
            foreach($array as $key2 => $val2){
                if($key>$key2 && $i <= 5){
                    $newArr[$key] += $val2;
                    $i++;
                }
            }
        }
        var_dump($newArr);

Output for git.master, git.master_jit, rfc.property-hooks: array(18) { ["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) ["date_2018_12"]=> int(21) ["date_2018_11"]=> int(20) ["date_2018_10"]=> int(18) ["date_2018_09"]=> int(15) ["date_2018_08"]=> int(11) ["date_2018_07"]=> int(6) }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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