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run code in 200+ php & hhvm versions
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<?php $array = ['aaa' => 'bbb']; $array['xxx'] = 'yyy'; var_dump($array);
based on g1mlD
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
array(2) { ["aaa"]=> string(3) "bbb" ["xxx"]=> string(3) "yyy" }