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run code in 150+ php & hhvm versions
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<?php $name = 'key'; $data = array('key' => false); var_dump(isset($data[$name]));
Output for 4.3.0 - 5.6.25, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(true)