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<?php $x = []; $x['a']['b'] = 'b'; $x['a']['c'] = 'c'; var_dump($x);
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.0rc3
array(1) { ["a"]=> array(2) { ["b"]=> string(1) "b" ["c"]=> string(1) "c" } }