when dealing with built-in extensions. (Sebastian)
- Added optional 3rd parameter to mysql_select_db() which makes it return
the previously selected database name. (Jani)
-- Set Content-Length header whenever possible. (Thies, Yasuo)
- Added large OID value (2^31 to 2^32) support for pg_lo_import(),
pg_lo_unlink(), pg_lo_open() and pg_lo_export(). (Yasuo)
- Made the mbstring extension enabled by default. (Yasuo)