将ecshop中的session读写方式，从DB转移到Memcached

使用ecshop有时候访问量大，需要提高读取效率的时候，需要把一部分数据转移到内存中去。这时候就需要经典的memcached了。以下代码经过测试绝对可用！

<?php

if (!defined('IN_ECS'))
{
die('Hacking attempt');
}

/*------------------------------------------------------ */
//-- 该类用于将SESSION直接写入Memcache站长教学网 eduyo.com
/*------------------------------------------------------ */
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 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 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
    }

}

(责任编辑：ken)

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将ecshop中的session读写方式，从DB转移到Memcached