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run code in 200+ php & hhvm versions
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<?php $date1 = new DateTime('2013-07-03'); $date2 = new DateTime('2014-03-12'); $diff = $date1->diff($date2); echo (($diff->format('%y') * 12) + $diff->format('%m'));
Output for 5.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.17.3, 7.0.0 - 7.2.0
8
Output for hhvm-3.12.14

Process exited with code 137.