title: Multiple database and transactions
body: <p>If i use two database, i have to start to transaction? Is this correct, or this code is wrong? If i make a mistake in the second query, then call rollback(), but unfortunately won't roll back the first query...</p>
  
  <pre><code> $conn_site=mysql_connect("localhost", "us", "ps");
   mysql_select_db("site",$conn_site); 
   $conn_forum=mysql_connect("localhost", "us", "ps");
   mysql_select_db("forum",$conn_forum); 
  
       function begin() {
  
           @mysql_query("BEGIN",$conn_site);
           @mysql_query("BEGIN",$conn_forum);
       }
      function commit_reg() {
          @mysql_query("COMMIT",$conn_site);
          @mysql_query("COMMIT",$conn_forum);
      }
      function rollback(){
          @mysql_query("ROLLBACK",$conn_site);
          @mysql_query("ROLLBACK",$conn_forum);
      }
     begin();
      mysql_query("insert into users (....) or rollback();
         mysql_query("insert into forumusers (....) or rollback();
      commit();
  </code></pre>