getid3_lib::flipped_array_merge_noclobber( mixed $array1, mixed $array2 ): array|false|null

568	public static function flipped_array_merge_noclobber($array1, $array2) {569		if (!is_array($array1) || !is_array($array2)) {570			return false;571		}572		# naturally, this only works non-recursively573		$newarray = array_flip($array1);574		foreach (array_flip($array2) as $key => $val) {575			if (!isset($newarray[$key])) {576				$newarray[$key] = count($newarray);577			}578		}579		return array_flip($newarray);580	}