1 <?php
2 class MemcacheSession
3 {
4 // memcache对象
5 private static $handler = null;
6 // 过期时间 秒
7 private static $lifetime = null;
8 // 当前时间
9 private static $time = null;
10 // session名前缀
11 private const NS = 'session_';
12
13 // 初始化
14 private static function init($handler)
15 {
16 self::$handler = $handler;
17 self::$lifetime = 1440;
18 self::$time = time();
19 }
20
21 // 外部调用初始化
22 public static function start(Memcached $memcached)
23 {
24 self::init($memcached);
25
26 // 自定义session存储介质
27 session_set_save_handler(
28 array(__CLASS__, 'open'),
29 array(__CLASS__, 'close'),
30 array(__CLASS__, 'read'),
31 array(__CLASS__, 'write'),
32 array(__CLASS__, 'destroy'),
33 array(__CLASS__, 'gc')
34 );
35 if (!headers_sent() && session_id() == '') session_start();
36 }
37
38 public static function open($path, $name)
39 {
40 return true;
41 }
42
43 public static function close()
44 {
45 return true;
46 }
47
48 public static function read($PHPSESSID)
49 {
50 $out = self::$handler->get(self::session_key($PHPSESSID));
51
52 if ($out === false || $out == null) return '';
53 return $out;
54 }
55
56 public static function write($PHPSESSID, $data)
57 {
58 return self::$handler->set(self::session_key($PHPSESSID), $data, self::$lifetime);
59 }
60
61 public static function destroy($PHPSESSID)
62 {
63 return self::$handler->delete(self::session_key($PHPSESSID));
64 }
65
66 public static function gc($lifetime)
67 {
68 return true;
69 }
70
71 private static function session_key($PHPSESSID)
72 {
73 $session_key = self::NS . $PHPSESSID;
74 return $session_key;
75 }
76 }
77
78 $memcached = new Memcached();
79 $memcached->addServer('127.0.0.1', 11211);
80 MemcacheSession::start($memcached);
81
82 // 写
83 $_SESSION['aaa'] = '你好世界';
84 // 读
85 var_dump($_SESSION);
