It might be better if the 24 $gmantis*_table variables could be redefined to use perhaps sprintf notation, for example $g_mantis_bug_file_table = '%s_bug_file_table'; Then after loading the user's config file, the sprintf substitution can be done with for example $g_mantis_bug_file_table = sprintf($g_mantis_bug_file_table, $g_db_table_prefix);

Using something like this sprintf notation here has the advantage that it preserves backward compatibility. Setups where the $g_db_table_prefix had been changed and the 24 $gmantis*_table variables had been copied to the config file will continue to work.

The other way would be to define the 24 $gmantis*_table variables to be just the suffixes, and later tack the $g_db_table_prefix on to the front with a concatenation. This would, however, not be backwards-compatible, and would break all existing config files that customize these variables, which is probably a bad idea, especially when backwards compatibility is possible with the sprintf method above.