XSS filtering function in PHP

Question

Does anyone know of a good function out there for filtering generic input from forms? Zend_Filter_input seems to require prior knowledge of the contents of the input and I\'

Answer 1

I found a solution for my problem with the posts with german umlaut. To provide from totally cleaning (killing) the posts, i encode the incoming data:

    *$data = utf8_encode($data);
    ... function ...*

And at last i decode the output to get correct signs:

    *$data = utf8_decode($data);*

Now the post go through the filter function and i get a correct result...