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<?php $a = array('a' => true,'b' => false, 'c' => false); $b = array('a' => false,'b' => true, 'c' => false); var_dump($a + $b) ?>
Output for 4.3.0 - 7.1.0
array(3) { ["a"]=> bool(true) ["b"]=> bool(false) ["c"]=> bool(false) }