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<?php var_dump(array( 't' => 1, test_dump => 123 ));
Output for 7.2.0 - 7.2.6
Warning: Use of undefined constant test_dump - assumed 'test_dump' (this will throw an Error in a future version of PHP) in /in/jn1bc on line 5 array(2) { ["t"]=> int(1) ["test_dump"]=> int(123) }
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant test_dump - assumed 'test_dump' in /in/jn1bc on line 5 array(2) { ["t"]=> int(1) ["test_dump"]=> int(123) }