(PECL memcached >= 0.1.1)
Memcached::addServers — Add multiple servers to the server pool
$servers
   )
   Memcached::addServers() adds
   servers to the server pool. Each entry in
   servers is supposed to be an array containing hostname,
   port, and, optionally, weight of the server. No connection is established
   to the servers at this time.
  
   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.
  
arrayArray of the servers to add to the pool.
   Returns TRUE on success or FALSE on failure.
  
Example #1 Memcached::addServers() example
<?php
$m = new Memcached();
$servers = array(
    array('mem1.domain.com', 11211, 33),
    array('mem2.domain.com', 11211, 67)
);
$m->addServers($servers);
?>