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run code in 150+ php & hhvm versions
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<?php error_reporting(E_ALL); var_dump(isset($a['k1']['k2']['k3']['k4']['k5']['k6']['k7']));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false)