WP w3all WordPress phpBB plugin install help page
The phpBB to WordPress way
The faster, easy and secure
WordPress phpBB 2.4.0 > integration by email
Note: follow this instead, if you want to integrate, configuring the WordPress to phpBB integration way.
The difference between this way to integrate, respect the WordPress to phpBB way, is mainly one: update changes done by users or admins into their phpBB profiles, are updated into WordPress for the same user, when the same user will visit the WordPress side as logged user in phpBB , or when will login in the WordPress side. Because this is a WordPress plugin (along next 2.4.0> releases, may a phpBB extension will be provided that will allow a complete update at mean time integration in the phpBB to WordPress way, adding or updating users in WordPress at mean time when updates occur in phpBB side). It is possible to use redirects tricks: if you want to force user addition into WordPress when user register OR login in phpBB using redirects tricks check this:
Add user into WordPress when register OR login in phpBB side
The other important thing that you need to consider, integrating in the phpBB to WordPress way, so where you’ll leave users to update their email and register only in phpBB, is that since the integration works by email, if you let users login in WordPress also, this is the case where the plugin may works as unexpected, because when searching for user by email on WP login action, and the email has been changed in phpBB, there is no way to check a match for the same user if usernames/email pairs mismatch. The user could so try to login by username, and will work if username match, but if it mismatch (the integration works by email, but try to check for username in this case, when a match not found by email) and phpBB usernames with forbidden WP characters have been may added in WP after removing those forbidden chars, so (also) the username will not match OR will match the username of some other user!
Consider that if you let users login in WordPress side in this scenario, an user that change his email in phpBB, then come to login into WordPress using email (because you allow users to login also in WP) the user will not be able to login by email, but only by username until a login not executed (that will cause so the email to be updated, based on username) and if username match. For the same reason, usernames on both phpBB and WordPress needs to match in this case.
In the phpBB to WordPress way you so choose to let users to Login, Register, Update Password in phpBB side BUT if managing an integration where mismatching usernames exists in some case, you SHOULD SO (it is REQUIRED in this case) LEAVE USERS to Register and update their email ONLY IN WordPress.
Note that it is not mandatory to transfer old phpBB users into WordPress when integration start, anyway there is a transfer option on plugin admin that you can activate to transfer old phpBB users into WordPress. Note also that as admin, if you want to change an email for an user at mean time also in WordPress when you change it may via phpBB ACP, you’ll have to do the same for the same user in WordPress, or until the same user will not visits the WP side, you’ll not see the same update in WordPress.
Consider that as WordPress admin, you could see that so in phpBB there are users that are still not existent in WordPress. The reason is the above explained when using the plugin in the phpBB to WordPress way.
This mode to integrate, phpBB to WordPress way, require as MANDATORY to disable user’s registration in WordPress and avoid user’s email change in WordPress. It is your task to not allow user’s registration and email update in WordPress side.
About the way on how phpBB usernames containing forbidden and not allowed characters into WordPress, are added or transferred into WordPress since 2.4.0> read this post:
Disable registration in WordPress, and be sure that users are NOT allowed to change/update password in WordPress.
Said all that, you need to follow same instructions, configuring phpBB and WordPress, as explained on WP to phpBB help, where
To Install and Configure
FOLLOW THESE STEPS
Follow phpBB Side and WordPress Side steps on that page, and remember (again) that it is your task to avoid user’s email update, and registration in WordPress, configuring based on all said above the integration in the phpBB to WordPress way.