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run code in 150+ php & hhvm versions
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<?php $arr = array('aaa' => 'a', 'bbb' => 'b'); $arr['dddd'] = 'ddd'; print_r($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [aaa] => a [bbb] => b [dddd] => ddd )