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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, 'abcde')); var_dump(isset($interval->abcde));
based on eMJ34
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.0.13, 7.1.10 - 7.3.0rc3
bool(false) bool(false)
Output for 7.0.14 - 7.1.7
Notice: Undefined property: DateInterval::$abcde in /in/PIcbM on line 3 bool(true) Notice: Undefined property: DateInterval::$abcde in /in/PIcbM on line 4 bool(false)