PHP notice message for badwords class

First of all thank you for this useful class, really appreciate your effort!

Have 1 question, Ive used this class as said in the description, but I seem to be getting PHP notice message for this line;

********** $filter .="$wordreplace[$f]"; **********

And message as follows;

**********Notice: Undefined offset: 8 in C:\PHP\...\badwords.php on line 48 **********

and line 48 is what I added above! Ignore the asterisks as I added for better visibility :)

I would appreciate if you could explain why this is happening, many thanks

add these two lines to sort badword list from largest to smallest

array_multisort(array_map('strlen',$badwords),$badwords);
$badwords=array_reverse($badwords);


This will insure all the profane word is removed and not just partially