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<?php var_dump(new \DateInterval('P1M')); $date = new \DateTime('2014-01-30'); var_dump($date->add(new \DateInterval('P1M')));
based on Xigc2
Output for 7.1.0 - 7.2.0
object(DateInterval)#1 (16) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["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) } object(DateTime)#1 (3) { ["date"]=> string(26) "2014-03-02 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.4.30 - 7.0.20
object(DateInterval)#1 (15) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(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) } object(DateTime)#1 (3) { ["date"]=> string(26) "2014-03-02 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.27 - 5.3.29, 5.4.17 - 5.4.29
object(DateInterval)#1 (15) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(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) } object(DateTime)#1 (3) { ["date"]=> string(19) "2014-03-02 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.3.20 - 5.3.26, 5.4.10 - 5.4.16
object(DateInterval)#1 (8) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["invert"]=> int(0) ["days"]=> bool(false) } object(DateTime)#1 (3) { ["date"]=> string(19) "2014-03-02 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }