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run code in 150+ php & hhvm versions
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<?php $data = array('key' => null); var_dump(isset($data['key'])); var_dump(array_key_exists('key', $data)); var_dump(array_key_exists('key', $data) && $data['key']);
based on uui1R
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true) bool(false)