"apple", "b"=>"ball", "c"=>"cat", "d"=>"dog"); $array2 = array("A"=>"APPLE", "b"=>"BALL", "c"=>"CAMEL", "d"=>"DOG"); $array3 = array("a"=>"Apple", "b"=>"Ball", "c"=>"Cat", "d"=>"Dog"); // Computing the intersection $result = array_uintersect_assoc($array1, $array2, $array3, "strcasecmp"); print_r($result); ?>