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run code in 200+ php & hhvm versions
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<?php $d = new DateInterval('PT1H0M'); print_r($d);
based on EFcEt
Output for 7.1.0 - 7.2.0
DateInterval Object ( [y] => 0 [m] => 0 [d] => 0 [h] => 1 [i] => 0 [s] => 0 [f] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [days] => [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for 5.3.27 - 5.3.29, 5.4.17 - 7.0.20
DateInterval Object ( [y] => 0 [m] => 0 [d] => 0 [h] => 1 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 0 [days] => [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for 5.3.20 - 5.3.26, 5.4.10 - 5.4.16
DateInterval Object ( [y] => 0 [m] => 0 [d] => 0 [h] => 1 [i] => 0 [s] => 0 [invert] => 0 [days] => )