网站 也就一天不到1000的IP ，总是 在 双核2G 10M 带宽的服务器放， MB 还是tt 卡的要死， 打开 mysql 慢查询日志,没几天就2G 多满查询， 结果看基本都是SESSION 引起的， 于是把 ECSHOP自身的SESSION 改成了MEMCACHED
放下代码:
效果:剩余时间：0时16分19秒 

 

<?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
	}
 
}
 
?>

  
用法: 直接备份原来的 includes/cls_session.php 这个文件就可以了
改成后发现网站速度飞快。


原文出处：http://www.wangzhibo.com/php/1046.html