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;$m->addServer('www.baidow.com', 11211);$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 = $all_items['www.baidow.com:11211']['items'];foreach ($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['www.baidow.com:11211']['curr_items'];//由于有其他key的缓存，因此这只是个接近数值} } ?>