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