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run code in 200+ php & hhvm versions
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<?php $message = ['message' => null]; var_dump(isset($message['message'])); var_dump(array_key_exists('message', $message));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
bool(false) bool(true)