If your PHP website only needs to recognize someone already logged into phpBB, it may be able to read phpBB’s session and user state. That is different from making forum and website logins and logouts act as one. The available session example is for phpBB 3.0, so first identify your installed phpBB version and use documentation that matches it.
Decide what “integrate users” means
There are two different goals, and they call for different approaches:
- Recognize an existing forum login: the website checks phpBB’s session to learn whether the visitor is logged in and, if so, access forum user data.
- Coordinate authentication: a login or logout in either application is reflected in the other, or both use a shared identity service. Reading forum session state alone does not provide this.
A legacy phpBB cross-site sessions article explicitly cautions that its approach does not log a person into the website when they log into phpBB. Its description of redirecting forum login and logout to a separate site’s controls is an account of one author’s 2008 implementation, not current security guidance. Read the phpBB Knowledge Base article on cross-site sessions.
Check your phpBB version before using an example
The session-integration example in phpBB’s Knowledge Base is labeled for phpBB 3.0 and dates to 2007. It demonstrates a historical integration pattern, not code verified for later releases. See the phpBB 3.0 session integration example.
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phpBB’s 3.3 documentation describes authentication plugins and extension-based providers. Do not assume a 3.0 example’s APIs or setup instructions are suitable for a 3.3 installation, or that 3.3 documentation describes a newer release. Confirm your exact phpBB and PHP versions, then follow the matching documentation.
For a PHP page that needs to recognize a phpBB session
The phpBB 3.0 Knowledge Base example follows this sequence for a PHP page integrated with the forum deployment:
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- Include phpBB’s
common.php. - Call
session_begin()to initialize the forum session. - Initialize the access-control list (ACL) using the user data.
- Call user setup before reading user information.
In that historical example, the page checks whether user_id is ANONYMOUS; it reads username_clean for a logged-in user. Treat these names and calls as details of the phpBB 3.0 example, not as a current, drop-in recipe. Check the integration approach and APIs for your installed release before adapting it.
This pattern is for a page that needs phpBB’s session and user state. It does not by itself make a separate website’s authentication system log the visitor in, synchronize account credentials, or coordinate logout.
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If the goal is for phpBB itself to authenticate against an external identity source or custom provider, use the extension approach documented for your phpBB version rather than treating session inclusion as a substitute. The phpBB 3.3 developer tutorial describes a provider class and YAML service registration, including registration with the auth.provider tag, followed by activation in the Administration Control Panel (ACP). It says that only one authentication provider may currently be active at a time, selected in the ACP. See the phpBB 3.3 authentication-provider tutorial.
The phpBB 3.3 provider API includes concepts for validating sessions, logging out, and linking or unlinking external accounts. Those API capabilities are not a complete implementation plan for a particular website or identity service. Review the phpBB 3.3 authentication-provider API.
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This approach changes how phpBB authenticates users; it is not simply a method for an existing PHP website to inspect a forum login. The two approaches solve different problems.
Compare the two approaches
| Approach | What it is for | What to verify |
|---|---|---|
| Website reads phpBB session state | Recognizing a visitor whose login is managed by phpBB, using session and user state in a PHP page. | Whether the page runs in a compatible deployment; whether the documented APIs match the installed phpBB release; whether recognition alone is enough. The cited example is for phpBB 3.0. Source. |
| phpBB authentication-provider extension | Having phpBB authenticate through an external identity source or custom provider. | Whether the provider supports the installed release, what extension work it requires, and the one-active-provider constraint documented for phpBB 3.3. Source. |
Do not treat shared cookies as single sign-on
The legacy cross-site article discusses matching cookie settings in a same-domain setup, but it is dated phpBB 3.0 guidance and does not establish a safe or suitable configuration for a current deployment. A shared cookie setting is not, by itself, a complete coordinated login and logout design. Choose an approach that matches your intended authentication flow and installed versions rather than copying old cookie instructions.
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Check server requirements against the installed release
The phpBB 3.3 User Guide lists PHP 7.2.0 or later as a requirement for that release, along with database requirements. This is a version-specific requirement, not confirmation that a particular host or a different phpBB version is compatible. Check the guide and requirements for the release you actually run. See the phpBB 3.3 User Guide.
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