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@ 2017-09-23T15:00:36Z

<?php

    $arr = array (
      0=>array(
        'date'=>'2017-09-01',
        'total'=>4
      ),
      1=>array(
        'date'=>'2017-09-07',
        'total'=>6
      ),
      2=>array(
        'date'=>'2017-09-12',
        'total'=>6
      ),
      3=>array(
        'date'=>'2017-09-14',
        'total'=>6
      )
    );
    // array with only dates to search in
    $dates = array_column($arr, "date"); 

    // Create an array with all dates from first item to last item
    $start = new DateTime($arr[0]["date"]);
    $end = new DateTime(end($arr)["date"]);

    $range = new DatePeriod($start, new DateInterval('P1D'), $end);
    // $range is now all dates from start to end minus last one.


    // Loop through the range 
    foreach($range as $date){
        //See if the current date exist is first array
        $find = array_search($date->format("Y-m-d"), $dates);
        If($find !== false){
             $result[] = $arr[$find]; // if it does copy it to result array
        }Else{
             // If not add it and create a total = 0
             $result[] = array('date' => $date->format("Y-m-d"), 'total' => 0);
        }
    }
    // Since the loop does not loop all dates we need to add the last item to result.
    $result[] = end($arr);
    Var_dump($result);

Output for git.master, git.master_jit, rfc.property-hooks: array(14) { [0]=> array(2) { ["date"]=> string(10) "2017-09-01" ["total"]=> int(4) } [1]=> array(2) { ["date"]=> string(10) "2017-09-02" ["total"]=> int(0) } [2]=> array(2) { ["date"]=> string(10) "2017-09-03" ["total"]=> int(0) } [3]=> array(2) { ["date"]=> string(10) "2017-09-04" ["total"]=> int(0) } [4]=> array(2) { ["date"]=> string(10) "2017-09-05" ["total"]=> int(0) } [5]=> array(2) { ["date"]=> string(10) "2017-09-06" ["total"]=> int(0) } [6]=> array(2) { ["date"]=> string(10) "2017-09-07" ["total"]=> int(6) } [7]=> array(2) { ["date"]=> string(10) "2017-09-08" ["total"]=> int(0) } [8]=> array(2) { ["date"]=> string(10) "2017-09-09" ["total"]=> int(0) } [9]=> array(2) { ["date"]=> string(10) "2017-09-10" ["total"]=> int(0) } [10]=> array(2) { ["date"]=> string(10) "2017-09-11" ["total"]=> int(0) } [11]=> array(2) { ["date"]=> string(10) "2017-09-12" ["total"]=> int(6) } [12]=> array(2) { ["date"]=> string(10) "2017-09-13" ["total"]=> int(0) } [13]=> array(2) { ["date"]=> string(10) "2017-09-14" ["total"]=> int(6) } }

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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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