pfSense

function walk_depend($depend, $pkgdb = "", $alreadyseen = "") {

	if (!$pkgdb) {

		$pkgdb = get_pkg_db();

	}

	if (!is_array($alreadyseen)) {

		$alreadyseen = array();

	}

	if (!is_array($depend)) {

		$depend = array();

	}

	foreach ($depend as $adepend) {

		$pkgname = reverse_strrchr($adepend['name'], '.');

		if (in_array($pkgname, $alreadyseen)) {

			continue;

		} elseif (!in_array($pkgname, $pkgdb)) {

			$size += expand_to_bytes($adepend['size']);

			$alreadyseen[] = $pkgname;

			if (is_array($adepend['depend'])) {

				$size += walk_depend($adepend['depend'], $pkgdb, $alreadyseen);

			}

		}

	}

	return $size;

}