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run code in 200+ php & hhvm versions
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<?php $interval = new DateInterval('P2D'); var_dump(property_exists($interval, 'd')); var_dump($interval->d);
Output for 7.0.14 - 7.2.6
bool(true) int(2)
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.0.13
bool(false) int(2)