chmod($file_path, $permission_level);
is_readable($file_path); //checks if file is readable is_writable($file_path); //checks if file is writableThe function used in the code examples is part of the standard PHP library, so no additional package library is required. To determine which package library is required for permission levels related to accessing APIs and databases, you would need to look at the specific library or API being used. For example, to use Google Maps API, you would need to use the Google Maps PHP library. Overall, permissions in PHP are important to keep resources secure and protected.