Boolean Island !

I was reading Hasin Bhai’s New book Object Oriented Programming with PHP5.In chapter 2 i got a nice example of OOP.Its a word counter.Its a nice tool actually and pretty little too.Here is that example.
<?
class WordCounter
{
const ASC=1;  //you need not use $ sign before Constants
const DESC=2;
private $words;
function __construct($filename)
{
$file_content = file_get_contents($filename);
$this->words =
(array_count_values(str_word_count(strtolower
($file_content),1)));
}
public function count($order)
{
if [...]