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run code in 150+ php & hhvm versions
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<?php $di = new DateInterval('P-1Y'); //$di->invert = 1; // Proper negative date interval var_dump($di);
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Exception: DateInterval::__construct(): Unknown or bad format (P-1Y) in /in/P1KFP:2 Stack trace: #0 /in/P1KFP(2): DateInterval->__construct('P-1Y') #1 {main} thrown in /in/P1KFP on line 2
Process exited with code 255.
Output for hhvm-3.12.0
Fatal error: Uncaught exception 'Exception' with message 'DateInterval::__construct: Invalid interval (P-1Y)' in /in/P1KFP:2 Stack trace: #0 /in/P1KFP(2): DateInterval->__construct() #1 {main}
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.0 - 5.6.28
Fatal error: Uncaught exception 'Exception' with message 'DateInterval::__construct(): Unknown or bad format (P-1Y)' in /in/P1KFP:2 Stack trace: #0 /in/P1KFP(2): DateInterval->__construct('P-1Y') #1 {main} thrown in /in/P1KFP on line 2
Process exited with code 255.
Output for 5.0.0 - 5.2.17
Fatal error: Class 'DateInterval' not found in /in/P1KFP on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: dateinterval in /in/P1KFP on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: dateinterval in /in/P1KFP on line 2