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