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<?php $array = ['test' => 'value']; echo "{$array[test]}";
Output for 7.2.0
Warning: Use of undefined constant test - assumed 'test' (this will throw an Error in a future version of PHP) in /in/6iQcA on line 5 value
Output for 5.4.2 - 7.1.10
Notice: Use of undefined constant test - assumed 'test' in /in/6iQcA on line 5 value
Output for 5.3.18 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/6iQcA on line 3
Process exited with code 255.