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Warning: mysql_set_charset() expects parameter 2 to be resource, boolean given in wp-content/plugins/wp-phpbb-bridge/inc/widgets/wpbb_topics_widget.php on line 149

This is an error caused by the fact that the WP phpBB Bridge plugin is naively written in places.

For instance, in this case the plugin authors don't expect you to be using a socket instead of a port. Looking at the documentation for mysql-pconnect you see that you can either use combination of hostname:port or hostname:socket. Since they are pulling the setup info straight from the phpBB config file, you have little to no control over the values there (especially if already configured).

What they ought to do is check to see if $port isset() && !empt() and only then append the ":" . $port. But instead, they tag on ":" to your db host EVERY TIME. This breaks your setup if you host is defined in phpBB with a socket. Most of what I just said sort of sounds like gibberish even to me, so, basically, if you are getting this error, the problem is actually line 147. Replace the current line 147 with this: