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run code in 150+ php & hhvm versions
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<?php $date1 = new DateTime('2014-01-01'); $date2 = DateTime::createFromFormat('Y-m-d', '2014-01-01'); echo $date1->format('Y-m-d') . "\n"; echo $date2->format('Y-m-d') . "\n"; echo "Is date1 < date2?\n"; echo $date1 < $date2 ? 'Yes' : 'No'; echo "Is date1 == date2?\n"; echo $date1 == $date2 ? 'Yes' : 'No';
based on Ji8u0
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
2014-01-01 2014-01-01 Is date1 < date2? YesIs date1 == date2? No
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.10 - 5.2.17
Fatal error: Call to undefined method DateTime::createFromFormat() in /in/la8EY on line 4
Process exited with code 255.
Output for 5.2.0 - 5.2.9
Fatal error: Call to undefined method DateTime::createfromformat() in /in/la8EY on line 4
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/la8EY 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/la8EY 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/la8EY on line 3