1 <?php
2 class MemSession{
3 private static $handler = null;
4 private static $lifetime = null;
5 private static $time = null;
6 const MS = 'session';
7
8 private static function init($handler){
9 self::$handler = $handler;
10 self::$lifetime = ini_get('session.gc_maxlifetime');
11 self::$time = time();
12 }
13
14 public static function start($memcache){
15 self::init($memcache);
16 //调用类中的方法要用数组,__CLASS__代表本类
17 session_set_save_handler(
18 array(__CLASS__,'open'),
19 array(__CLASS__,'close'),
20 array(__CLASS__,'read'),
21 array(__CLASS__,'write'),
22 array(__CLASS__,'destroy'),
23 array(__CLASS__,'gc')
24 );
25 session_start();
26 }
27
28 public static function open($path,$name){
29
30 }
31 public static function close(){
32
33 }
34
35 public static function read($PHPSESSID){
36 $val = self::$handler->get(self::session_key($PHPSESSID));
37
38 if($val===false || $val==null){
39 return false;
40 }
41 return $val;
42 }
43 public static function write($PHPSESSID,$data){
44 $method = $data? 'set':'replace';
45 return self::$handler->$method(self::session_key($PHPSESSID),$data,MEMCACHE_COMPRESSED,self::$lifetime);
46 }
47
48 public static function destroy($PHPSESSID){
49 return self::$handle->delete(self::session_key($PHPSESSID));
50 }
51 //memcache本身就有限定时间，数据自动销毁，所以可不使用gc方法
52 public static function gc($lifetime){
53 return true;
54 }
55
56 //给sessionID加前缀，避免key重复
57 private static function session_key($PHPSESSID){
58 $session_key = self::MS.$PHPSESSID;
59 return $session_key;
60 }
61 }
62 $mem = new Memcache;
63 $mem->connect("localhost",11211) or die("could not connect");
64 MemSession::start($mem);