<?php

//PHP 5.3 版本
$handler = new sinacloud\sae\MemcacheSessionHandler();
session_set_save_handler(
    array($handler, 'open'),
    array($handler, 'close'),
    array($handler, 'read'),
    array($handler, 'write'),
    array($handler, 'destroy'),
    array($handler, 'gc')
);

session_start();
...

//PHP 5.6 版本
$handler = new sinacloud\sae\MemcacheSessionHandler();
session_set_save_handler($handler, true);

session_start();

如果不是SAE环境，就可能要去php.ini里设计了

 session.save_handler = memcache
 session.save_path ="tcp://127.0.0.1:11211"

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