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<?php $baseDate = new DateTime('2017-01-01', new DateTimezone('UTC')); $endDate = clone $baseDate; for($i = 1; $i <= 4; ++$i) { $m = $i*15; $duration = new DateInterval("PT{$m}M"); $endDate->add($duration); } $totalDuration = $baseDate->diff($endDate); var_dump($totalDuration); echo $totalDuration->format('%a days, %h hours, %i minutes');
based on YvumJ
Output for 7.1.0 - 7.3.0rc3
object(DateInterval)#3 (16) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(2) ["i"]=> int(30) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(0) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } 0 days, 2 hours, 30 minutes
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.0.20
object(DateInterval)#3 (15) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(2) ["i"]=> int(30) ["s"]=> int(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> int(0) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } 0 days, 2 hours, 30 minutes
Output for hhvm-3.15.4
object(DateInterval)#7 (0) { } 0 days, 2 hours, 30 minutes