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<?php $a = array('a' => 'b', 'c' => 'd'); $a['x'] = 'z'; var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { ["a"]=> string(1) "b" ["c"]=> string(1) "d" ["x"]=> string(1) "z" }