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run code in 200+ php & hhvm versions
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<?php $test = []; var_dump(isset($test['test']['test']));
based on rtPVW
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.22.0, 7.0.0 - 7.3.0alpha1
bool(false)