public function delete_import_files($contextid) {
        global $USER;

        $fs = get_file_storage();

        return $fs->delete_area_files($contextid,
                                      'assignfeedback_file',
                                      ASSIGNFEEDBACK_FILE_IMPORT_FILEAREA,
                                      $USER->id);
    }
public function delete_import_files($contextid) {
        global $USER;

        $fs = get_file_storage();

        return $fs->delete_area_files($contextid,
                                      'assignfeedback_file',
                                      ASSIGNFEEDBACK_FILE_IMPORT_FILEAREA,
                                      $USER->id);
    }
public function delete_import_files ( $ contextid ) { global $ USER ; $ fs = get_file_storage ( ) ; return $ fs -> delete_area_files ( $ contextid , 'assignfeedback_file' , ASSIGNFEEDBACK_FILE_IMPORT_FILEAREA , $ USER -> id ) ; }
Delete all temp files used when importing a zip

@param int $contextid - The context id of this assignment instance
@return bool true if all files were deleted
Delete all temp files used when importing a zip