Fix various PHP code bugs found using static analysis (#1489086)

Aleksander Machniak

2013-05-06 ce89ecd54277fdd8113320ba463dfab6d504b00c

 program/lib/Roundcube/rcube_db.php

@@ -128,7 +128,7 @@
        $dsn_string  = $this->dsn_string($dsn);
        $dsn_options = $this->dsn_options($dsn);

        if ($db_pconn) {
        if ($this->db_pconn) {
            $dsn_options[PDO::ATTR_PERSISTENT] = true;
        }