session 机制改成memcache 存储

<!--?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 $_time = 0;     function __construct(&#038;$db, $session_table, $session_data_table, $session_name = 'ECS_ID', $session_id = '')    {		$m = new Memcache;        $m--->addServer('127.0.0.1', 11211);        $this-&gt;cls_session($m, $session_name, $session_id);    }     function cls_session(&amp;$db, $session_name = 'ECS_ID', $session_id = '')    {        $GLOBALS['_SESSION'] = array();         if (!empty($GLOBALS['cookie_path']))        {            $this-&gt;session_cookie_path = $GLOBALS['cookie_path'];        }        else        {            $this-&gt;session_cookie_path = '/';        }         if (!empty($GLOBALS['cookie_domain']))        {            $this-&gt;session_cookie_domain = $GLOBALS['cookie_domain'];        }        else        {            $this-&gt;session_cookie_domain = '';        }         if (!empty($GLOBALS['cookie_secure']))        {            $this-&gt;session_cookie_secure = $GLOBALS['cookie_secure'];        }        else        {            $this-&gt;session_cookie_secure = false;        }         $this-&gt;session_name       = $session_name;         $this-&gt;db  = &amp;$db;        $this-&gt;_ip = real_ip();         if ($session_id == '' &amp;&amp; !empty($_COOKIE[$this-&gt;session_name]))        {            $this-&gt;session_id = $_COOKIE[$this-&gt;session_name];        }        else        {            $this-&gt;session_id = $session_id;        }         if ($this-&gt;session_id)        {            $tmp_session_id = substr($this-&gt;session_id, 0, 32);            if ($this-&gt;gen_session_key($tmp_session_id) == substr($this-&gt;session_id, 32))            {                $this-&gt;session_id = $tmp_session_id;            }            else            {                $this-&gt;session_id = '';            }        }         $this-&gt;_time = time();         if ($this-&gt;session_id)        {            $this-&gt;load_session();        }        else        {            $this-&gt;gen_session_id();            setcookie($this-&gt;session_name, $this-&gt;session_id . $this-&gt;gen_session_key($this-&gt;session_id), 0, $this-&gt;session_cookie_path, $this-&gt;session_cookie_domain, $this-&gt;session_cookie_secure);        }        register_shutdown_function(array(&amp;$this, 'close_session'));    }     function gen_session_id()    {        $this-&gt;session_id = md5(uniqid(mt_rand(), true));         return $this-&gt;insert_session();    }     function gen_session_key($session_id)    {        static $ip = '';         if ($ip == '')        {            $ip = substr($this-&gt;_ip, 0, strrpos($this-&gt;_ip, '.'));        }         return sprintf('%08x', crc32(!empty($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] . ROOT_PATH . $ip . $session_id : ROOT_PATH . $ip . $session_id));    }     function insert_session()    {    	return $this-&gt;db-&gt;set($this-&gt;session_id, array('expiry'=&gt;$this-&gt;_time, 'ip'=&gt;$this-&gt;_ip, 'data'=&gt;'a:0:{}'), false, $this-&gt;max_life_time);    }     function load_session()    {		$session = $this-&gt;db-&gt;get($this-&gt;session_id);        if (empty($session))        {            $this-&gt;insert_session();            $this-&gt;session_expiry = 0;            $this-&gt;session_md5 = '40cd750bba9870f18aada2478b24840a';            $GLOBALS['_SESSION'] = array();        }        else        {            if (!empty($session['data']) &amp;&amp; $this-&gt;_time - $session['expiry'] &lt;= $this-&gt;max_life_time)            {                $this-&gt;session_expiry = $session['expiry'];                $this-&gt;session_md5 = md5($session['data']);                $GLOBALS['_SESSION']  = unserialize(stripslashes($session['data']));            }            else            {                $this-&gt;session_expiry = 0;                $this-&gt;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']);        $this-&gt;_time = time();         if ($this-&gt;session_md5 == md5($data) &amp;&amp; $this-&gt;_time &lt; $this-&gt;session_expiry + 10)        {            return true;        }         $data = addslashes($data);     	return $this-&gt;db-&gt;replace($this-&gt;session_id, array('expiry'=&gt;$this-&gt;_time, 'ip'=&gt;$this-&gt;_ip, 'userid'=&gt;$userid, 'adminid'=&gt;$adminid, 'data'=&gt;$data), false, $this-&gt;max_life_time);    }     function close_session()    {    	$this-&gt;update_session();        return true;    }     function delete_spec_admin_session($adminid)    {        if (!empty($GLOBALS['_SESSION']['admin_id']) &amp;&amp; $adminid)        {            $all_items = $this-&gt;db-&gt;getExtendedStats('items');			$items = $all_items['127.0.0.1:11211']['items'];			foreach ($items as $key =&gt; $item) {				if (isset($item['adminid'])) {					if ($item['adminid'] == $adminid) return $this-&gt;db-&gt;delete($key);				}			}        }        else        {            return false;        }    }     function destroy_session()    {        $GLOBALS['_SESSION'] = array();         setcookie($this-&gt;session_name, $this-&gt;session_id, 1, $this-&gt;session_cookie_path, $this-&gt;session_cookie_domain, $this-&gt;session_cookie_secure);         /* ECSHOP 自定义执行部分 */        if (!empty($GLOBALS['ecs']))        {			$GLOBALS['db']-&gt;query('DELETE FROM ' . $GLOBALS['ecs']-&gt;table('cart') . " WHERE session_id = '$this-&gt;session_id'");        }        /* ECSHOP 自定义执行部分 */     	return $this-&gt;db-&gt;delete($this-&gt;session_id);    }     function get_session_id()    {        return $this-&gt;session_id;    }     function get_users_count()    {		$all_items = $this-&gt;db-&gt;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    } } ?&gt;