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run code in 150+ php & hhvm versions
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<?php $date1 = new DateTime('2010-01-01'); $date2 = new DateTime('2010-03-01'); var_dump( $date2 < $date1 );
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/WMJpd on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/WMJpd on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/WMJpd on line 3