| class_loader | The class loader resolves class names to file system paths and loads them if necessary. |
| config_php_file | |
| content_visibility | phpbb_visibility Handle fetching and setting the visibility for topics and posts |
| datetime | phpBB custom extensions to the PHP DateTime class This handles the relative formats phpBB employs |
| error_collector | |
| file_downloader | |
| filesystem | A class with various functions that are related to paths, files and the filesystem |
| finder | The finder provides a simple way to locate files in the core and a set of extensions |
| json_response | JSON class |
| pagination | |
| path_helper | A class with various functions that are related to paths, files and the filesystem |
| permissions | |
| recursive_dot_prefix_filter_iterator | Class recursivedotprefixfilteriterator |
| session | Session class |
| symfony_request | WARNING: The Symfony request does not escape the input and should be used very carefully prefer the phpbb request as possible |
| user | Base user class |
| user_loader | User loader class |
| version_helper | Class to handle version checking and comparison |
| viewonline_helper | Class to handle viewonline related tasks |