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run code in 150+ php & hhvm versions
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<?php $data['test'] = 'user@website.com'; var_dump($data['confirmed']); var_dump(isset($data['confirmed']));
based on bXmHY
Output for 5.3.0 - 7.1.0
Notice: Undefined index: confirmed in /in/vIIKa on line 3 NULL bool(false)
Output for 4.3.0 - 5.2.17
Notice: Undefined index: confirmed in /in/vIIKa on line 3 NULL bool(false)