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<?php $r = array(); $r['kk'][] = '123'; var_dump($r);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["kk"]=> array(1) { [0]=> string(3) "123" } }