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@ 2017-10-24T07:17:08Z

<?php
$arr = Array
(
    0 => Array
        (
            "year" => "2016",
            "numb" => 1
        ),
    1 => Array
        (
            "year" => "2016",
            "numb" => 3
        ),
    2 => Array
        (
            "year" => "2017",
            "numb" => 3
        ),
    3 => Array
        (
            "year" => "2016",
            "numb" => 1
        ),
    4 => Array
        (
            "year" => "2018",
            "numb" => 2
        )
);
    // create new array with year as key and numb as value
    $res =array();
    Foreach($arr as $val){
        If(!isset($res[$val["year"]])) $res[$val["year"]] =0;
        $res[$val["year"]] += $val["numb"];

    }

    ksort($res); // sort the array on keys to make earliest year first
    $newarr= array();
    $sum =0;
    foreach($res as $key => $val){
        $newarr[$key] = $val+$sum; // new array with summed values from previous year(s)
        $sum +=$val;
    }
    Var_dump($newarr);

Output for git.master, git.master_jit, rfc.property-hooks: array(3) { [2016]=> int(5) [2017]=> int(8) [2018]=> int(10) }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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