function parameter is ignored when set to false

Thanks for the script.

I added a functionality to do a compare case insensitive by adding an additional parameter 'ignore_case'.

    $phpStringCompare = new StringCompare($string1, $string2,

                                    array('remove_html_tags'=>true, 'remove_extra_spaces'=>true, 'ignore_case'=>true,

                                    'remove_punctuation'=>true, 'punctuation_symbols'=>Array('.', ','))

                                );

I found that when I set the 'ignore_case' parameter to true the script functions as normal. When I set the 'ignore_case' to false then too the script does a case insensitive comparison.
By modifying the lines from

        if (!empty($params['ignore_case'])) {

            $this->_ignore_case = $params['ignore_case'];

        }

to

        if (isset($params['ignore_case'])) {

            $this->_ignore_case = $params['ignore_case'];

        }

the script works as expected. This I guess is because of !empty check. false value returns empty using the check and hence skips the steps. Please correct me if I'm missing something.
Thanks,
Pari