bestimmte forenids über php file zuweisen

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$crew = $db->query ("SELECT
        bb".$n."_threads.boardid,
        bb".$n."_threads.location,
        bb".$n."_threads.topic,
        bb".$n."_threads.size,
        bb".$n."_threads.crewid,
        bb".$n."_threads.starterid,
        bb".$n."_threads.threadid,
        bb".$n."_threads.starter,
        bb".$n."_threads.starterid,
        bb".$n."_boards.title
        FROM bb".$n."_threads
        LEFT JOIN bb".$n."_users ON (bb".$n."_users.userid=bb".$n."_threads.lastposterid)
        LEFT JOIN bb".$n."_boards ON (bb".$n."_boards.boardid=bb".$n."_threads.boardid)
        ORDER BY bb".$n."_threads.starttime DESC LIMIT 5");