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<?php $data = []; $data["a"]["b"]["c"][] = "d"; print_r($data);
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
Array ( [a] => Array ( [b] => Array ( [c] => Array ( [0] => d ) ) ) )