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<?php $a = array('a' => false,'b' => false, 'c' => false); $b = array(); print_r(array_diff($a, $b)) ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [a] => [b] => [c] => )