[PHPTAL] setPreFilter dosen't work?

[Mynthon]

1st thing: i don't know why but  'PHPTAL/Filter.php' isn't included by
default. Is it necessary to set up phptal dir if i have right include
path in my php.ini?

2nd. can't use setPreFilter. Code:


class MyPostFilter implements PHPTAL_Filter {
    public function filter($xhtml){
        echo 'test';
        return $xhtml;
    }
}

$template->setPostFilter(new MyPostFilter());
echo $template->execute();

works ok. but:

class MyPreFilter implements PHPTAL_Filter {
    public function filter($source){
      echo 'test';
      return $source;
    }
}

$template->setPreFilter(new MyPreFilter());
echo $template->execute();

doesn't work. Ive also tried:

public function filter($source){
      exit();
}

and

public function filter($source){
      return '';
}

and

public function filter($source){
      return 'test';
}

but it does not work (i always get template file generated properly). Any ideas?
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