"apple", "b"=>"ball", "c"=>"cat", "d"=>"dog"); $array2 = array("A"=>"APPLE", "b"=>"ball", "c"=>"camel"); $array3 = array("c"=>"Cat", "d"=>"DOG"); // Computing the difference $result = array_udiff_assoc($array1, $array2, $array3, "strcasecmp"); print_r($result); ?>