One of my follower send me this question in email, seeking my help to split a date array in to possible date ranges in PHP Laravel framework, and he want to get ranges based on consecutive day orders.

He has an array which contains a set of dates as in the example bellow.

 $days =array (
    '2018-10-15',
    '2018-10-16',
    '2018-10-17',
    '2018-10-18',
    '2018-10-19',
    '2018-10-20',
    '2018-10-21',
    '2018-10-22',
    '2018-10-23',
    /* MISSING 2018-10-24 */
    '2018-10-25',
    '2018-10-26',
    '2018-10-27',
    '2018-10-28',
    '2018-10-29',
    '2018-10-30',
    '2018-10-31',
    '2018-11-01',
    '2018-11-02',
    /* MISSING 2018-11-03 */
    '2018-11-04',
    '2018-11-05',
    '2018-11-06',
    '2018-11-07',
    '2018-11-08',
    '2018-11-09',
    '2018-11-10',
    '2018-11-11',
    '2018-11-12',
    '2018-11-13',
    '2018-11-14',
    '2018-11-15',
    '2018-11-16',
    '2018-11-17',
    '2018-11-18',
    '2018-11-19',
    '2018-11-20',
    '2018-11-21',
    '2018-11-22',
    '2018-11-23',
    '2018-11-24',
    '2018-11-25',
    '2018-11-26',
    '2018-11-27',
    '2018-11-28',
    '2018-11-29',
    '2018-11-30',
    '2018-12-01',
    '2018-12-02',
    '2018-12-03',
    '2018-12-04',
    '2018-12-05',
    '2018-12-06',
    '2018-12-07',
    '2018-12-08',
    '2018-12-09',
    '2018-12-10',
);

 before jump to write our solution, let looks at how our expected output should be for above set of dates,

$date_ranges = Array ( 
       [0] => Array ( [0] => 2018-10-15 [1] => 2018-10-23 ) 
       [1] => Array ( [0] => 2018-10-25 [1] => 2018-11-02 ) 
       [2] => Array ( [0] => 2018-11-04 [1] => 2018-12-10 ) 
 ) 

Looking at the expected final out put,
we have 3 possible ranges from the set of dates ,  because "2018-10-24", "2018-11-03" are missing in the dates array, which breaks the consecutive order.

Here is the PHP function which I wrote as a helper function which expect date array argument and can bring the output as in the example above,

function getDateRangeSplitted($dates)
{
    sort($dates);
    $startDate  = $dates[0];
    $finishDate = array_pop($dates);
    // walk through the dates, breaking at gaps
    foreach ($dates as $key => $date)
        if (($key > 0) && (strtotime($date)-strtotime($dates[$key-1]) > 99999)) {
            $result[] = array($startDate,$dates[$key-1]);
            $startDate = $date;
        }
    // force the end
    $result[] = array($startDate,$finishDate);
    return $result;
}