将ecshop中的session从mysql移植到memcache的方法

将ecshop中的session机制重写,从DB移植到Memcache中去，经过测试绝对可用！(最模板未测试)

代码如下：

<?php

if (!defined('IN_ECS'))

{

die('Hacking attempt');

}

/*------------------------------------------------------ */

//-- 该类用于将SESSION直接写入Memcache

/*------------------------------------------------------ */

class cls_session

{

var $db = NULL;

var $max_life_time = 1800; // SESSION 过期时间

var $session_name = '';

var $session_id = '';

var $session_expiry = '';

var $session_md5 = '';

var $session_cookie_path = '/';

var $session_cookie_domain = '';

var $session_cookie_secure = false;

var $_ip = '';

var $_time = 0;

function __construct(&$db, $session_table, $session_data_table, $session_name = 'ECS_ID', $session_id = '')

{

$m = new Memcache;

$m->addServer('127.0.0.1', 11211);

$this->cls_session($m, $session_name, $session_id);

}

function cls_session(&$db, $session_name = 'ECS_ID', $session_id = '')

{

$GLOBALS['_SESSION'] = array();

if (!empty($GLOBALS['cookie_path']))

{

$this->session_cookie_path = $GLOBALS['cookie_path'];

}

else

{

$this->session_cookie_path = '/';

}

if (!empty($GLOBALS['cookie_domain']))

{

$this->session_cookie_domain = $GLOBALS['cookie_domain'];

}

else

{

$this->session_cookie_domain = '';

}

if (!empty($GLOBALS['cookie_secure']))

{

$this->session_cookie_secure = $GLOBALS['cookie_secure'];

}

else

{

$this->session_cookie_secure = false;

}

$this->session_name = $session_name;

$this->db = &$db;

$this->_ip = real_ip();

if ($session_id == '' && !empty($_COOKIE[$this->session_name]))

{

$this->session_id = $_COOKIE[$this->session_name];

}

else

{

$this->session_id = $session_id;

}

if ($this->session_id)

{

$tmp_session_id = substr($this->session_id, 0, 32);

if ($this->gen_session_key($tmp_session_id) == substr($this->session_id, 32))

{

$this->session_id = $tmp_session_id;

}

else

{

$this->session_id = '';

}

}

$this->_time = time();

if ($this->session_id)

{

$this->load_session();

}

else

{

$this->gen_session_id();

setcookie($this->session_name, $this->session_id . $this->gen_session_key($this->session_id), 0, $this->session_cookie_path, $this->session_cookie_domain, $this->session_cookie_secure);

}

register_shutdown_function(array(&$this, 'close_session'));

}

function gen_session_id()

{

$this->session_id = md5(uniqid(mt_rand(), true));

return $this->insert_session();

}

function gen_session_key($session_id)

{

static $ip = '';

if ($ip == '')

{

$ip = substr($this->_ip, 0, strrpos($this->_ip, '.'));

}

return sprintf('%08x', crc32(!empty($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] . ROOT_PATH . $ip . $session_id : ROOT_PATH . $ip . $session_id));

}

function insert_session()

{

return $this->db->set($this->session_id, array('expiry'=>$this->_time, 'ip'=>$this->_ip, 'data'=>'a:0:{}'), false, $this->max_life_time);

}

function load_session()

{

$session = $this->db->get($this->session_id);

if (empty($session))

{

$this->insert_session();

$this->session_expiry = 0;

$this->session_md5 = '40cd750bba9870f18aada2478b24840a';

$GLOBALS['_SESSION'] = array();

}

else

{

if (!empty($session['data']) && $this->_time - $session['expiry'] <= $this->max_life_time)

{

$this->session_expiry = $session['expiry'];

$this->session_md5 = md5($session['data']);

$GLOBALS['_SESSION'] = unserialize(stripslashes($session['data']));

}

else

{

$this->session_expiry = 0;

$this->session_md5 = '40cd750bba9870f18aada2478b24840a';

$GLOBALS['_SESSION'] = array();

}

}

}

function update_session()

{

$adminid = !empty($GLOBALS['_SESSION']['admin_id']) ? intval($GLOBALS['_SESSION']['admin_id']) : 0;

$userid = !empty($GLOBALS['_SESSION']['user_id']) ? intval($GLOBALS['_SESSION']['user_id']) : 0;

$data = serialize($GLOBALS['_SESSION']);

$this->_time = time();

if ($this->session_md5 == md5($data) && $this->_time < $this->session_expiry + 10)

{

return true;

}

$data = addslashes($data);

return $this->db->replace($this->session_id, array('expiry'=>$this->_time, 'ip'=>$this->_ip, 'userid'=>$userid, 'adminid'=>$adminid, 'data'=>$data), false, $this->max_life_time);

}

function close_session()

{

$this->update_session();

return true;

}

function delete_spec_admin_session($adminid)

{

if (!empty($GLOBALS['_SESSION']['admin_id']) && $adminid)

{

$all_items = $this->db->getExtendedStats('items');

$items = $all_items['127.0.0.1:11211']['items'];

foreach ($items as $key => $item) {

if (isset($item['adminid'])) {

if ($item['adminid'] == $adminid) return $this->db->delete($key);

}

}

}

else

{

return false;

}

}

function destroy_session()

{

$GLOBALS['_SESSION'] = array();

setcookie($this->session_name, $this->session_id, 1, $this->session_cookie_path, $this->session_cookie_domain, $this->session_cookie_secure);

/* ECSHOP 自定义执行部分 */

if (!empty($GLOBALS['ecs']))

{

$GLOBALS['db']->query('DELETE FROM ' . $GLOBALS['ecs']->table('cart') . " WHERE session_id = '$this->session_id'");

}

/* ECSHOP 自定义执行部分 */

return $this->db->delete($this->session_id);

}

function get_session_id()

{

return $this->session_id;

}

function get_users_count()

{

$all_items = $this->db->getExtendedStats();

return $count = $all_items['127.0.0.1:11211']['curr_items'];//由于有其他key的缓存，因此这只是个接近数值

}

}

?>