select() sets new index even on error #836
Description
$redis = new Redis;
$redis->connect('127.0.0.1');
// int(0)
var_dump($redis->getDbNum());
// Sends SELECT -1, Redis replies with -ERR invalid DB index.
// This prints false. Could also be done with index = 1000 (which is invalid in Redis).
var_dump($redis->select(-1));
// int(-1)
var_dump($redis->getDbNum());
Clearly the last call should print int(0) or whatever the original, previously correctly set database index was.