View file Web Template Ktpl/package/system/controllers/ktpl/hooks/content_before_item.php

<?php

class onKtplContentBeforeItem extends cmsAction {

    public function run($data){

    	if(!$this->options['filter_on_content'] || empty($this->options['filter_fields'])) return $data;

		list($ctype, $item, $fields) = $data;

        foreach ($fields as $field) {

        	if(!in_array($field['name'], explode(',', str_replace(' ', '', $this->options['filter_fields'])))) continue;

            $fields[$field['name']]['html'] = $this->text_filter($fields[$field['name']]['html']);

        }

        return array($ctype, $item, $fields);

    }

}