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<?php $arr1 = array('potato'=>1,'tomato'=>2,'apple'=>5,'banana'=>10); $arr2 = array('orange'=>20,'tomato'=>3,'apple'=>5,'banana'=>20); $result = array_keys(array_diff(array_intersect_key($arr1, $arr2), $arr2)); print_r($result);
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Array ( [0] => tomato [1] => banana )