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<?php var_dump(new \DateInterval('PT3H59M59S'));
Output for 7.1.0 - 7.2.9
object(DateInterval)#1 (16) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(3) ["i"]=> int(59) ["s"]=> int(59) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> bool(false) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for 5.6.30, 7.0.0 - 7.0.31
object(DateInterval)#1 (15) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(3) ["i"]=> int(59) ["s"]=> int(59) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> bool(false) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for hhvm-3.15.4 - 3.22.0
object(DateInterval)#1 (0) { }