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<?php $diff = DateTime::createFromFormat('Y-m-d', '1999-09-08')->diff(DateTime::createFromFormat('Y-m-d', '1999-01-15')); print_r($diff);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
DateInterval Object ( [y] => 0 [m] => 7 [d] => 24 [h] => 0 [i] => 0 [s] => 0 [f] => 0 [invert] => 1 [days] => 236 [from_string] => )
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
DateInterval Object ( [y] => 0 [m] => 7 [d] => 24 [h] => 0 [i] => 0 [s] => 0 [f] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 236 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for 5.4.17 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20
DateInterval Object ( [y] => 0 [m] => 7 [d] => 24 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 236 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for 5.4.0 - 5.4.16
DateInterval Object ( [y] => 0 [m] => 7 [d] => 24 [h] => 0 [i] => 0 [s] => 0 [invert] => 1 [days] => 236 )

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