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@ 2017-09-05T05:05:32Z

<?php
$start = "2017-01-08";
$stop = "2017-01-20";
$chosenInterval = "week";
function getDates($start, $stop, $chosenInterval = "week") {
    $startDT = new DateTime($start);
    $stopDT = new DateTime($stop);
    if(isset($chosenInterval) && ($chosenInterval == "week" || $chosenInterval == "day") ) {
        $timeFormat = "F j, Y"; 
    } else {
        $timeFormat = "F Y";
        $chosenInterval = "month";
    }
    
    $begin    = (new DateTime($start))->modify('first day of this month');
    $end      = (new DateTime($stop))->modify('first day of next month');
    $interval = DateInterval::createFromDateString('1 '.$chosenInterval);
    $period   = new DatePeriod($begin, $interval, $end);
    
    foreach($period as $dt) {
        if ($chosenInterval !== "month" && ($dt < $startDT || $dt > $stopDT)) continue;
        $dataLabels[] = $dt->format($timeFormat);
    }
    return $dataLabels;
}
var_dump(getDates($start, $stop));
var_dump(getDates($start, $stop, "day"));
var_dump(getDates($start, $stop, "month"));

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { [0]=> string(15) "January 8, 2017" [1]=> string(16) "January 15, 2017" } array(13) { [0]=> string(15) "January 8, 2017" [1]=> string(15) "January 9, 2017" [2]=> string(16) "January 10, 2017" [3]=> string(16) "January 11, 2017" [4]=> string(16) "January 12, 2017" [5]=> string(16) "January 13, 2017" [6]=> string(16) "January 14, 2017" [7]=> string(16) "January 15, 2017" [8]=> string(16) "January 16, 2017" [9]=> string(16) "January 17, 2017" [10]=> string(16) "January 18, 2017" [11]=> string(16) "January 19, 2017" [12]=> string(16) "January 20, 2017" } array(1) { [0]=> string(12) "January 2017" }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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