"apple", "b"=>"ball", "c"=>"cat", "d"=>"dog"); $array2 = array("a"=>"APPLE", "B"=>"ball", "c"=>"camel"); $array3 = array("d"=>"DOG", "e"=>"elephant"); // Computing the difference $result = array_udiff_uassoc($array1, $array2, $array3, "strcasecmp", "strcasecmp"); print_r($result); ?>