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<?php $array1 = array('test1' => array('blah', 'blahd')); $array2 = array('test1' => array('blah1', 'blahd2')); var_dump($array1 + $array2);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { ["test1"]=> array(2) { [0]=> string(4) "blah" [1]=> string(5) "blahd" } }
Output for hhvm-3.10.0

Process exited with code 153.