linickx

Do you have a phpBB forum, do you want to drag your blog readers into your forum ? Then this plugin might just help, you can include somewhere in wordpress a list of recent phpbb threads (topics) in a page, a post, and even in your theme – so your sidebar for example !
<h3>A bit about Database configuration.</h3>
If wordpress & phpBB share a DB already then set $PHPBBDB to DB_NAME and everything will be fine, else you.re going to need to GRANT the wordpress user read access to phpBB. (If you really need to, you can store the phpbb databse credential in the plugin using the “Insecure” connectivity method.)
<h3>How to GRANT wordpress read only access to phpBB ?</h3>
If you don.t know it already you need to find your wordpress mysql user id, it.ll be in wp-config.php
<pre><code>define('DB_USER', 'wp_user'); // Your MySQL username
</code></pre>
and you should have already found your phpbb database & table for the above. 
You need to type the following syntax into your mysql database
<pre><code>GRANT SELECT ON phpbb_database.phpbb_topics TO wp_user@localhost;
</code></pre>
AND
<pre><code>GRANT SELECT ON phpbb_database.phpbb_forums TO wp_user@localhost;
</code></pre>
AND
<pre><code>GRANT SELECT ON phpbb_database.phpbb_posts TO wp_user@localhost;
</code></pre>
this can be achieved by logging into phpmyadmin as your phpbb user, selecting SQL and pasting the correct GRANT into the text box.
<h3>How to use the Insecure Database Connectivity Method</h3>
From the phpbb_recent_topics admin / settings page, tick the .Enable Insecure Database Connection. box, and submit, when the page re-freshes you.ll have some more boxes to populate, from your phpbb config.php fill in
<pre><code>$dbuser = phpbb MySQL Database UserName
$dbpasswd = phpbb MySQL Database Password
$dbhost = phpbb MySQL Server
</code></pre>
Click update, and you should be connected!
<h3>The Callback function</h3>
To allow users to customize what is / can be displayed a callback function <code>phpbb_topics_callback</code> has been implemented.
In ticket 1216 (https://plugins.trac.wordpress.org/ticket/1216) phil suggested that the forum name should be displayed within the topic list; the following code is an example use of the new callback function and should be added to your themes functions.php
<pre><code>function phpbb_topics_callback($phpbbdb, $wpdb, $lnx_PRT_options, $topic) {

 // GET FORUM WHICH POST IS IN - Phil Ewels, 26/09/2010
 $sql_query = "SELECT * FROM $lnx_PRT_options[prt_phpbb_ft] WHERE forum_id=" . $topic->forum_id. " LIMIT 1";

 # Run Query
 if ($lnx_PRT_options['prt_phpbb_dbinsecureon'] == "1") {
 $forum = $phpbbdb->get_row($sql_query);
 } else {
 $forum = $wpdb->get_row($sql_query);
 }

 echo " " . $forum->forum_name . " ";

}
</code></pre>
The following variables can be used within your callback function: 
* $wpdb 
** If using Secure Connectivity this is a connection to your PHPBB Database 
** If using Insecure Connectivity this is the standard WordPress Database 
* $phpbbdb 
** If using Secure Connectivity this will be NULL 
** If using Insecure Connectivity this is a connection to your PHPBB Database 
* $lnx_PRT_options 
** An array of the phpbb-recent-topics settings 
* $topic 
** The current topic, with associated attributes.

phpbb_recent_topics

This plugin grabs your recent phpBB forum topics for you to display in wordpress.

jhong

Bridge phpBB and WordPress!
WP-United glues together WordPress sites and phpBB forums. Get the full power of WordPress publishing and plugins, with the familiar and established community format of phpBB.
WP-United is fully modular and individual features can be turned on and off. These features include:
<ul>
<li>User integration: including single sign-on, synchronised profiles and avatars, and user management. Works with external registration modules such as social login plugins. Users in phpBB get accounts in WordPress and vice versa. Completely controllable and customisable by setting permissions for who can integrate and at what level, using a unique drag-and-drop interface.</li>
<li>Template integration: Have your phpBB forum appear inside your WordPress site. Or vice-versa; integrate your WordPress blog inside your phpBB header and footer. Includes a “one-click” mode that analyses your theme’s CSS and modifies it on the fly to avoid CSS and HTML conflicts. This is no iFrame solution, it is a complete and automatic template integration.</li>
<li>Behaviour integration: Use phpBB smilies and word censor features in WordPress </li>
<li>Cross-posting: Post something in WordPress and have it cross-posted to your forum — Automatically or manually, you choose! Once an item is cross-posted, comments in phpBB and WordPress can be set to sync up under the blog item too!</li>
</ul>
WP-United also includes TEN widgets for you to drop into your WordPress page. Each widget is configurable and displays a wealth of forum information to increase engagement on your site. All of these widgets work even with the above modules turned off. They are:
<ul>
<li>Latest forum posts</li>
<li>Latest forum topics</li>
<li>users online list</li>
<li>Forum statistics</li>
<li>An integrated login/meta/avatar/profile block</li>
<li>Birthday list</li>
<li>Quick poll (select from active phpBB polls in an ajax widget)</li>
<li>Useful forum links list</li>
<li>Forum top bar (with breadcrumbs that work in WordPress)</li>
<li>Forum bottom bar (to match the top bar!)</li>
</ul>
Visit <a href="http://www.wp-united.com" rel="nofollow ugc">wp-united.com</a> for more information and to view example integrations in the gallery.
The download iincludes the following languages:
<ul>
<li>English</li>
<li>Français</li>
<li>Deutsch</li>
<li>中文（简体）</li>
<li>русский</li>
<li>Srpski (Latinica)</li>
<li>Português Brasileiro</li>
</ul>

phpbb_recent_topics vs WP-United : phpBB WordPress Integration