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@ 2021-08-06T07:09:38Z

<?php

$data[2020] = array_fill_keys(range(1,12), '1,000');
$data[2021] = array_fill_keys(range(1,8), '1,500');
$data[2021][9] = null;
$data[2021][10] = null;
$data[2021][11] = null;
$data[2021][12] = null;

$thisYear = $year ?? date('Y');
$lastYear = $thisYear - 1;
$thisYearRunningTotal = 0;
$lastYearRunningTotal = 0;
$result = [];
for ($month = 1; $month <= 12; ++$month) {
    $thisYearMonthTotal = $data[$thisYear][$month];  // from model
    $thisYearRunningTotal = $thisYearMonthTotal === null
        ? null
        : (int)str_replace(',', '', $thisYearMonthTotal) + $thisYearRunningTotal;
        
    $lastYearMonthTotal = $data[$lastYear][$month];  // from model
    $lastYearRunningTotal = $lastYearMonthTotal === null
        ? null
        : (int)str_replace(',', '', $lastYearMonthTotal) + ($lastYearRunningTotal ?? 0);

    $result[] = [
        'month' => $month,
        'total_now' => $thisYearRunningTotal,
        'total_before' => $lastYearRunningTotal,
    ];
}
var_export($result);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 0 => array ( 'month' => 1, 'total_now' => 1500, 'total_before' => 1000, ), 1 => array ( 'month' => 2, 'total_now' => 3000, 'total_before' => 2000, ), 2 => array ( 'month' => 3, 'total_now' => 4500, 'total_before' => 3000, ), 3 => array ( 'month' => 4, 'total_now' => 6000, 'total_before' => 4000, ), 4 => array ( 'month' => 5, 'total_now' => 7500, 'total_before' => 5000, ), 5 => array ( 'month' => 6, 'total_now' => 9000, 'total_before' => 6000, ), 6 => array ( 'month' => 7, 'total_now' => 10500, 'total_before' => 7000, ), 7 => array ( 'month' => 8, 'total_now' => 12000, 'total_before' => 8000, ), 8 => array ( 'month' => 9, 'total_now' => NULL, 'total_before' => 9000, ), 9 => array ( 'month' => 10, 'total_now' => NULL, 'total_before' => 10000, ), 10 => array ( 'month' => 11, 'total_now' => NULL, 'total_before' => 11000, ), 11 => array ( 'month' => 12, 'total_now' => NULL, 'total_before' => 12000, ), )

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Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

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2016-08-14 Arrow functions - withdrawn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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