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<?php $test[null] = Neutral; echo isset($test['lang']);
based on jLt2W
Output for 7.2.0
Warning: Use of undefined constant Neutral - assumed 'Neutral' (this will throw an Error in a future version of PHP) in /in/jnC0L on line 3
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant Neutral - assumed 'Neutral' in /in/jnC0L on line 3