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<?php $first = array(foo => 123, bar => 456); var_dump($first); ?>
based on 4P3UB
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant foo - assumed 'foo' in /in/uC94R on line 3 Notice: Use of undefined constant bar - assumed 'bar' in /in/uC94R on line 3 array(2) { ["foo"]=> int(123) ["bar"]=> int(456) }