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WP2SMFBridge is a simple one way bridge from WordPress to Simple Machine Forum (v2 tested). This means, this one uses databases of SMF Forum and sync to WP database every time a user performs login or logout action in WP. To get this working only use WP to register/login/logout. Also, WP and SMF must be installed in same domain, and should not be being accessed through a subdomain, though it still work. For example, if your website contains of WordPress for news and SMF for forum, if your news is mydomain.com, then your forums should be somewhere like mydomain.com/forum.
This plugin will do these following tasks:
<ul>
<li>If a user log in WP, then that user will be logged in SMF.</li>
<li>If a user logout in WP, then that user will be logout in SMF.</li>
<li>If a user created/register/change password in WP, those actions happen on SMF!</li>
<li>Users that are created in SMF can be used once disabled WP plugin.</li>
<li>For a full way integration use with SMF2WPBridge plugin. 
https://github.com/xchwarze/SMF2WPBridge 
http://custom.simplemachines.org/mods/index.php?mod=4030</li>
</ul>
<h3>Notes</h3>
Every time a user logged in SMF forum, same username (will be created if not exist) will be logged in WordPress. Because SMF is placed in higher order, so user in WordPress will be changed to SMF with same role.
For example, you have an administrator named “admin” in wordpress, after WP2SMFBridge fully activated, the SMF user named “admin” can login as that administrator. So be careful!

WP2SMFBridge

Login bridge from Wordpress to Simple Machine Forum.

Smoerble

This widget displays all members from a SMF forum. Depending on your settings, it displays only the name or name + avatar image, if user didn’t set an avatar in the SMF forum, it displays a generic image you can specify (see the example image below). Support: http://www.longu.de/_smfgm_redirect.php
The plugin adds a seperate configuration menu in the WP admin panel (called “SMF Groups”). You need to add the following data:
<ol>
<li>Add the database connection details to your Simple Machine Forum database.</li>
<li>Enter ID of the SMF member group you want to display in the widget.</li>
<li>Modify the HTML code for the widget.</li>
<li>If you want to display member avatars (from SMF), you NEED to modify the /attachments/.htaccess file.</li>
</ol>
Each field has an example what it should include.
The field “Limit” determines how many mambers are listed in total. Dummy image is optional. Needs to be a http:// URL. If you set it, it uses this image if a user has no image set in his SMF profile.
Important: SMF 2.0 adds a .htaccess file at “/forum/attachments/.htaccess”. This file blocks all requests from different domains. So if you want to use this widget to display a member group from a SMF forum from a different server/domain, you NEED to modify this .htaccess file (the needed steps are explained in the admin section of this widget).
Feedback needed! This is a very early version of the plugin. If you like it, it can be improved a lot, for example:
<ul>
<li>Links from each avatar to SMF profiles</li>
<li>Links from each avatar to other profiles (like FB)</li>
<li>More options for templating</li>
<li>Tag option to displays one member or all members inside a blog entry/article</li>
<li>Several predefined output settings</li>
<li>Better caching/performance (though it should be suitable for your needs already)</li>
<li>…</li>
</ul>

SMF Group Members

New admin screen with group dropdown! This widget displays all members from a SMF forum. It can display only the names or name + avatar image.

WP2SMFBridge vs SMF Group Members