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run code in 150+ php & hhvm versions
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<?php $obj = new stdClass(); $obj->property1 = FALSE; var_dump(isset($obj->property1)); unset($obj->property1); var_dump(isset($obj->property1)); $obj->property1 = FALSE; var_dump(isset($obj->property1));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
bool(true) bool(false) bool(true)