MYSQLND_OPT_AUTH_PROTOCOL  644 ext/mysqlnd/mysqlnd.c 		conn->m->set_client_option(conn, MYSQLND_OPT_AUTH_PROTOCOL, requested_protocol TSRMLS_CC);
MYSQLND_OPT_AUTH_PROTOCOL 2404 ext/mysqlnd/mysqlnd.c 		case MYSQLND_OPT_AUTH_PROTOCOL: