1、安装memcached
#apt-get install memcached
2、安装php-memcache扩展支持；
#apt-get install php5-memcache
<?php
ini_set('session.save_handler', 'memcache');
ini_set('session.save_path', '127.0.0.1:11211');
session_start();
$_SESSION['test'] = 10;
echo $_SESSION['test']. ' session_id '. session_id(). "\n";
exit;
// test memcache config
$memobj = memcache_connect('127.0.0.1', '11211');
$memobj->set('sess', '11211');
$string = $memobj->get('sess');
echo "string = $string !\n";
$memobj->close();