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<?php $a = array('k' => array(1,2), 'j' => array(3,4)); var_dump($a);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { ["k"]=> array(2) { [0]=> int(1) [1]=> int(2) } ["j"]=> array(2) { [0]=> int(3) [1]=> int(4) } }