(PECL memcached >= 0.1.0)
Memcached::addServer — Add a server to the server pool
Memcached::addServer() adds the specified server to the
server pool. No connection is established to the server at this time, but
if you are using consistent key distribution option (via
Memcached::DISTRIBUTION_CONSISTENT or
Memcached::OPT_LIBKETAMA_COMPATIBLE), some of the
internal data structures will have to be updated. Thus, if you need to add
multiple servers, it is better to use
Memcached::addServers() as the update then happens
only once.
The same server may appear multiple times in the server pool, because no
duplication checks are made. This is not advisable; instead, use the
weight option to increase the selection weighting of
this server.
host
The hostname of the memcache server. If the hostname is invalid,
data-related operations will set
Memcached::RES_HOST_LOOKUP_FAILURE result code. As
of version 2.0.0b1, this parameter may also specify the path of a unix
socket filepath ex. /path/to/memcached.sock
to use UNIX domain sockets, in this case port
must also be set to 0.
port
The port on which memcache is running. Usually, this is
11211. As of version 2.0.0b1, set this parameter to 0 when
using UNIX domain sockets.
weightThe weight of the server relative to the total weight of all the servers in the pool. This controls the probability of the server being selected for operations. This is used only with consistent distribution option and usually corresponds to the amount of memory available to memcache on that server.
Example #1 Memcached::addServer() example
<?php
$m = new Memcached();
/* Add 2 servers, so that the second one
is twice as likely to be selected. */
$m->addServer('mem1.domain.com', 11211, 33);
$m->addServer('mem2.domain.com', 11211, 67);
?>