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run code in 150+ php & hhvm versions
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<?php $test = array('name' => 'mf'); var_dump($test['ID']);
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined index: ID in /in/YjZ6Q on line 3 NULL
Output for 4.3.0 - 5.2.17
Notice: Undefined index: ID in /in/YjZ6Q on line 3 NULL