Quickest, safe way to add servers using pecl-memcached and persistent connections.

pecl_memcached_quick.php

<?php

// Let's assume this is coming from a config file somewhere
// that we can trust to not have duplicate servers in the list.
$servers = array(
    array("host" => 'localhost', "port" => 11211, "weight" => 10),
    array("host" => 'localhost', "port" => 11212, "weight" => 20)
);

$mc = new Memcached("test");

/**
 * We simply check if this is a newly create object. If it is, we add the
 * servers. The down side of this is if you want to remove connections to 
 * servers due to the server list changing, you will need to restart all
 * your PHP workers.
 */
if($mc->isPristine()){
    $mc->addServers($servers);
}