foreach(array_keys($array) as $key0) {
	//Main cat stuff
	$array[str_replace(' ', '_', $key0)] = $array[$key0];
	unset($array[$key0]);
	$key0 = str_replace(' ', '_', $key0);
	foreach(array_keys($array[$key0]) as $key1) {
		//sub cat stuff
		$array[$key0][str_replace(' ', '_', $key1)] = $array[$key0][$key1];
		unset($array[$key0][$key1]);
	}
}