Why HTMLPurifier does not work in inktype

[eluser]Déjà Vu[/eluser]
Ok, I change the version for PHP4

And see that the previous code does not work, so I decided to do the purify process to the model for get comments (mdl_comments.php)

Code:

function get() {

            $this->load->library('HTMLPurifier');
            $purifier_config = HTMLPurifier_Config::createDefault();
            $purifier_config->set('Core', 'Encoding', 'UTF-8'); // replace with your encoding
            $this->htmlpurifier->purify( $comment , $purifier_config );
            $comment = $clean_comment

But now I get this error

Code:

Parse error: syntax error, unexpected T_VARIABLE in /home/cienciasm/domains/cienciasmicrobiologicas.org/public_html/application/models/mdl_comments.php on line 38

At that line the code is:

Code:

$this->_prep_query();
        $query = $this->db->get("comments");

Why doesn`t works?
Please help me