-echo 'MOVE s1 1 ' . $r->move('s1', 1) . "\n";
-echo 'SMEMBERS s1 ' . print_r($r->smembers('s1'), true) . "\n";
-echo 'SELECT 1 ' . $r->select_db(1) . "\n";
-echo 'SMEMBERS s1 ' . print_r($r->smembers('s1'), true) . "\n";
-echo 'SELECT 0 ' . $r->select_db(0) . "\n";