Tetra WebBBS Configuration
$SFU_subject and all the other related $SFU_*** variables build a set of optional configurations to expand the SearchFriendlyURL approach and to help those site owners who are interested in SEO stuff. This feature was sponsored by Julian von Heyl (http://www.korrekturen.de) in 2009 for Tetra-WebBBS 6.10. - Thanks Julian.
If $SFU_subject is set to "1" an optional parameter will be appended to URLs of links pointing to message display pages. This additional parameter is built based on the subject of the post and is formatted to become part of the URL.
New in 6.10
Default formatting intends to remove everything which is redundant (such as the 'Re: ' part of message subject lines) or which is a non-word character (such as interpunctation). HTML is removed as well.
Formatting can be tweaked by a set of subsequent variables.
Examples of how URLs may look if this option is enabled: