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run code in 200+ php & hhvm versions
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<?php $a = array('a' => 1, 'b' => 2); $b = array('a', 'b'); $result = array_diff($a, array_flip($b)); var_dump($result);
Output for 4.3.0 - 7.2.0
array(1) { ["b"]=> int(2) }