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<?php var_dump(array_diff_assoc(array('a' => array(true)), array('b' => array(false))));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["a"]=> array(1) { [0]=> bool(true) } }