protected function prepare_per_region_arrays() {
        $result = array();
        foreach ($this->regions as $region => $notused) {
            $result[$region] = array();
        }
        return $result;
    }
protected function prepare_per_region_arrays() {
        $result = array();
        foreach ($this->regions as $region => $notused) {
            $result[$region] = array();
        }
        return $result;
    }
protected function prepare_per_region_arrays ( ) { $ result = array ( ) ; foreach ( $ this -> regions as $ region => $ notused ) { $ result [ $ region ] = array ( ) ; } return $ result ; }
Returns an array of region names as keys and nested arrays for values

@return array an array where the array keys are the region names, and the array
values are empty arrays.
Returns an array of region names as keys and nested arrays for values