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run code in 150+ php & hhvm versions
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<?php $diff = date_create()->diff(date_create('-2 years')); print_r($diff);
based on JnJL2
Output for 7.1.0
DateInterval Object ( [y] => 2 [m] => 0 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [f] => -1.0E-5 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 730 [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 - 5.4.45, 5.6.28, 7.0.14
DateInterval Object ( [y] => 2 [m] => 0 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 730 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for 5.5.24 - 5.6.21, 7.0.0 - 7.0.6
DateInterval Object ( [y] => 2 [m] => 0 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [weekday] => 0 [weekday_behavior] => 0 [first_last_day_of] => 0 [invert] => 1 [days] => 731 [special_type] => 0 [special_amount] => 0 [have_weekday_relative] => 0 [have_special_relative] => 0 )
Output for hhvm-3.12.0
DateInterval Object ( )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.3.26, 5.4.0 - 5.4.16
DateInterval Object ( [y] => 2 [m] => 0 [d] => 0 [h] => 0 [i] => 0 [s] => 0 [invert] => 1 [days] => 730 )
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined method DateTime::diff() in /in/Iofsa on line 2
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function date_create() in /in/Iofsa on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/Iofsa on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/Iofsa on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Iofsa on line 2
Process exited with code 255.