Now you can integrate your WordPress and phpBB logins without destroying your databases.(hopefully) The plugin uses the login methods of phpBB and WordPress, so its not messing with the databases directly. The plugin holds the phpBB registration system as the main because it has the greatest control and flexibility (user activiation and information).
As with all plugins, there is an unforeseen risk and caution should be used.

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What the plugin actually does:
Redirects users to a login page which verifies the users login information with phpBB and logs them into WordPress accordingly. If the user doesnt exist in WP, then the user is created, given the default role, and logged in. If the users email or password changes (through phpBB), then the information is updated in WordPress. The biggest advantage over this way as opposed to others is that the two databases are not changed at all. If you were to uninstall WphpBB-Login, the users would still be there as WordPress users with their settings intact. The only part which would show a difference is that not all of the information would be filled out in the profile. (This could easily be fixed.)
Notes:
The cookie for phpBB is a sensitive one. If you are having trouble with staying logged in throughout the website, you may need to alter how the cookie is created through phpBB.

You do not need this if you have WPHPBB v2.5. It later versions it will come with the main plugin.

Directions

FAQ

Version v0.13: download now

  • lots of stuff between 0.9 and this, but no time to note
  • fixed error with globals and login replacement - thanks Steven Barre.

Version 0.9: download now

  • fixed typo (Thanks Mark C)
  • fixed stdclass error with logout, again.
  • fixed options page
  • put a little bit of formating in (though I may need to make them optional)
  • fixed avatars for non-wphpbb users

Version 0.8: download now

  • fixed error with $user_ip.
  • fixed name of wphpbb-login-plugin

Version 0.7: download now

  • instructions included to modify phpBB to redirect to wphpbb-login.
  • fixes to handle redirecting to phpBB.

Version 0.5: download now

  • separated wphpbb-login into separate file. (if its activated along with wphpbb, wphpbb takes over)
  • made it standalone (does not need wphpbb).