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I think that if you read those two pages of the code documentation (the DBAL class and the DBAL_Mysqli class ), and if you look more closely at the code itself, you'll understand better the DBAL system :)

For example, your code must be :
$sql = 'SELECT topic_title, forum_id, topic_id, topic_first ...

It's only a code used by the BBCode parser :)
All tags defined within bbcodes.html are not parsed using this definition. Indeed, some simple tags (eg B, I, U...) can be parsed directly by the parser which has a default HTML replacement for them. The bbcode_bitfield stores (in binary) which of the ...

If you don't change the bbcodes.html template file, you should keep prosilver's value.
Otherwise, tell us what BBCodes you have changed and we'll give you the correct value

Everything is explained in the Coding Guidelines page (look after the explanation for BEGINELSE)

You have to change the default value of phpbb_users.user_options from 895 to 1919 (895 + 2^10, 10 being the "id" for popuppm).
If you have MySQL, execute the following query with PhpMyAdmin for example (replace phpbb_ with your own prefix if necessary):
ALTER TABLE `phpbb_users` MODIFY `user ...

It depends on what version of MySQL you had...
If it was 4.1.3 or greater, then you only need to add the "i" in the config.php file :) (by the way, mysqli works perfectly with those versions of MySQL)
If it was lower than 4.1.3, it's more difficult because the schema is different.
I think (note that ...

What is the difference between the mysql and mysqli extensions for PHP?

The mysql extension does not support the full functionality of MySQL versions greater than 4.1.0, such as Stored Procedures, Triggers, Views, Precision Math and much more. In order to use all functions of the latest MySQL ...

The memory usage is displayed only if the information is available. Your host has probably disabled the function memory_get_usage()

mysqli is less old than the "normal" mysql extension and supports more features (such prepared queries, an object oriented style besides the procedural one, etc.). But ...

utf8_bin is used by default (with Mysql >= 4.1). You generally don't need to worry about the collation since the installer creates the tables using the relevant one