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<?php var_dump(unserialize('O:12:"DateInterval":1:{s:1:"y";C:3:"GMP":17:{s:4:"1234";a:0:{}}}'));
based on F3JJ9
Output for 7.1.0 - 7.2.0
object(DateInterval)#1 (16) { ["y"]=> int(-1) ["m"]=> int(-1) ["d"]=> int(-1) ["h"]=> int(-1) ["i"]=> int(-1) ["s"]=> int(-1) ["f"]=> float(-1) ["weekday"]=> int(-1) ["weekday_behavior"]=> int(-1) ["first_last_day_of"]=> int(-1) ["invert"]=> int(0) ["days"]=> int(-1) ["special_type"]=> int(0) ["special_amount"]=> int(-1) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for 5.6.12 - 5.6.20, 5.6.28, 7.0.20
object(DateInterval)#1 (15) { ["y"]=> int(-1) ["m"]=> int(-1) ["d"]=> int(-1) ["h"]=> int(-1) ["i"]=> int(-1) ["s"]=> int(-1) ["weekday"]=> int(-1) ["weekday_behavior"]=> int(-1) ["first_last_day_of"]=> int(-1) ["invert"]=> int(0) ["days"]=> int(-1) ["special_type"]=> int(0) ["special_amount"]=> int(-1) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for 5.3.27 - 5.3.29, 5.4.17 - 5.4.43, 5.5.24 - 5.5.27, 7.0.6
Warning: Class __PHP_Incomplete_Class has no unserializer in /in/iFm7W on line 3 Notice: Object of class __PHP_Incomplete_Class could not be converted to int in /in/iFm7W on line 3 object(DateInterval)#1 (15) { ["y"]=> int(1) ["m"]=> int(-1) ["d"]=> int(-1) ["h"]=> int(-1) ["i"]=> int(-1) ["s"]=> int(-1) ["weekday"]=> int(-1) ["weekday_behavior"]=> int(-1) ["first_last_day_of"]=> int(-1) ["invert"]=> int(0) ["days"]=> int(-1) ["special_type"]=> int(0) ["special_amount"]=> int(-1) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for 5.6.7 - 5.6.11, 7.0.0 - 7.0.5
object(DateInterval)#1 (15) { ["y"]=> int(1234) ["m"]=> int(-1) ["d"]=> int(-1) ["h"]=> int(-1) ["i"]=> int(-1) ["s"]=> int(-1) ["weekday"]=> int(-1) ["weekday_behavior"]=> int(-1) ["first_last_day_of"]=> int(-1) ["invert"]=> int(0) ["days"]=> int(-1) ["special_type"]=> int(0) ["special_amount"]=> int(-1) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for 5.4.44 - 5.4.45, 5.5.28 - 5.5.35, 5.6.21
Warning: Class __PHP_Incomplete_Class has no unserializer in /in/iFm7W on line 3 object(DateInterval)#1 (15) { ["y"]=> int(-1) ["m"]=> int(-1) ["d"]=> int(-1) ["h"]=> int(-1) ["i"]=> int(-1) ["s"]=> int(-1) ["weekday"]=> int(-1) ["weekday_behavior"]=> int(-1) ["first_last_day_of"]=> int(-1) ["invert"]=> int(0) ["days"]=> int(-1) ["special_type"]=> int(0) ["special_amount"]=> int(-1) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) }
Output for 5.3.18 - 5.3.26, 5.4.2 - 5.4.16
Warning: Class __PHP_Incomplete_Class has no unserializer in /in/iFm7W on line 3 Notice: Object of class __PHP_Incomplete_Class could not be converted to int in /in/iFm7W on line 3 object(DateInterval)#1 (8) { ["y"]=> int(1) ["m"]=> int(-1) ["d"]=> int(-1) ["h"]=> int(-1) ["i"]=> int(-1) ["s"]=> int(-1) ["invert"]=> int(-1) ["days"]=> int(-1) }