I wanted to display the name of the actual used filter on the view_all_bug_page.php, but could not acces the id of the filter
there because only the whole filter-string is passed. Any ideas how
i can access the filter name?
Not easily. The filter is a structure that comes from the database (mantis_filters_table). Please submit this as an enhancement request on the tracker. It would be pretty simple to add the filter name to the structure when it was fetched.