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<?php $dates = [ new DateTime('2017-04-22 12:45:49.000000'), new DateTime('2017-04-21 12:45:49.000000'), new DateTime('2015-04-18 12:45:49.000000'), ]; sort($dates); $i = 0; $previous = null; foreach ($dates as $date) { if ($previous && $date->diff($previous)->days > 1) { $i++; } $groups[$i][] = $date; $previous = $date; } var_dump($groups);
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.1.0 - 7.3.0beta1
array(2) { [0]=> array(1) { [0]=> object(DateTime)#3 (3) { ["date"]=> string(26) "2015-04-18 12:45:49.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } } [1]=> array(2) { [0]=> object(DateTime)#2 (3) { ["date"]=> string(26) "2017-04-21 12:45:49.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } [1]=> object(DateTime)#1 (3) { ["date"]=> string(26) "2017-04-22 12:45:49.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } } }