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<?php $a = ['a' => []]; $c = &$a['a']; $c['b'] = 2; var_dump($a);
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.2.9
array(1) { ["a"]=> &array(1) { ["b"]=> int(2) } }