PHP class instance that implements database interaction based on session, session instance

PHP class instance that implements database interaction based on session, session instance_PHP tutorial

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Release： 2016-07-13 09:45:09

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PHP class instance that implements database interaction based on session, session instance

The example in this article describes the class that PHP implements database interaction based on session. Share it with everyone for your reference. The details are as follows:

<&#63;php
/**
 * session 数据库存储类
 */
class Session {
 private static $session_id   = 0;
 private static $session_data  = array();
 private static $is_update   = FALSE;
 private static $is_del    = FALSE;
 private static $is_gc    = FALSE;
 private static $dbo    = NULL;  //数据库连接句柄
 private static $gc_max_time  = 1440;
 private static $table   = 'sessions';
 private static $pre_key   = 'weige';//session 密钥
 //捆绑使用哈
 private static $gc_rate_de  = 100;//代表分母
 private static $gc_rate_co  = 20;//代表分子
 private static $path   = '/';//保存路径
 private static $domain   = null; //域
 private static $secure   = false;//默认
 private static $httponly  = false;//默认
 /**
  * 获取数据库句柄 私有
  */
 private static function open() 
 {
  if (!self::$dbo) 
  {
   self::$dbo = Db::factory();
  }
  return TRUE;
 }
 /**
  * 设置
  * */
 public static function set($key, $val=NULL) 
 {
  self::open();
  $data = self::read();
  if ($data === FALSE)
  {
   $data = array();
  }
  if (!$val && is_array($key))
  {
   $data = $key;
  } 
  else if ($val && is_string($key))
  {
   $data[$key] = $val;
  }
  self::write($data);
  self::close();
 }
 /**
  *获取值 
  * 
  */
 public static function get($key=NULL) {
  self::open();
  self::$session_data = self::read();
  $ret = '';
  if (!$key) {
   $ret = self::$session_data;
  } else if(is_array(self::$session_data) && isset(self::$session_data[$key])) {
   $ret = self::$session_data[$key];
  }
  self::update(); 
  self::close();
  return $ret;
 }
 /**
  * 删除或者重置
  * */
 public static function del($key)
 {
  if (!self::$is_del) 
  {
   self::open();
   $val = self::read();
   if (isset($val[$key])) 
   {
    unset($val[$key]);
   }
   $session_id  = self::$session_id;
   $session_data  = serialize($val);
   $session_expire = TIME + self::get_gc_maxtime();
   self::$dbo->query("update ".self::$table." set value='$session_data', expiry='$session_expire' where session_id='$session_id'");
   self::close();
  }
  self::$is_del = TRUE;
 }
 /**
  * 销毁
  * 
  * */
 public static function destroy() 
 {
  $session_id   = self::get_session_id();
  $_COOKIE['WBSID'] = '';
  self::open();
  self::$dbo->query("delete from ".self::$table." where session_id='$session_id'");
  self::close();
 }
 /**
  * 读取 私有
  * */
 private static function read()
 {
  $session_id = self::$session_id;
  if (!$session_id) {
   $session_id = self::get_session_id();
  }
  if (!$session_id) return array();
  $user_agent = isset($_SERVER['HTTP_USER_AGENT']) &#63; md5($_SERVER['HTTP_USER_AGENT']) : '';
  $client_ip = Fun::getIp();
  $session_expire = TIME - self::get_gc_maxtime();
  $rs = self::$dbo->fetchRow("select session_id, value, agent, ip from ".self::$table."
   where session_id='$session_id' and expiry>'$session_expire'");
  if (!$rs || $rs['agent'] != $user_agent || $rs['ip'] != $client_ip) 
  {
   return FALSE;
  }
  self::$session_id = $rs['session_id'];
  return unserialize($rs['value']);
 }
 /**
  * session 写入 私有
  * */
 private static function write(array $session_data) 
 {
  $session_id = self::$session_id;
  if (!$session_id)
  {
   $session_id = self::get_session_id();
  }
  $session_expire = TIME + self::get_gc_maxtime();
  $user_agent = isset($_SERVER['HTTP_USER_AGENT']) &#63; md5($_SERVER['HTTP_USER_AGENT']) : '';
  $client_ip  = Fun::getIp();
  $session_data = serialize($session_data);
  if (self::$session_id && self::$session_id === $session_id) 
  {
   self::$dbo->query("update ".self::$table." set value='$session_data', expiry='$session_expire', agent='$user_agent', ip='$client_ip' where session_id='$session_id'");
  } 
  else 
  {
   self::$session_id = $session_id = self::create_session_id();
   self::$dbo->query("insert into ".self::$table."(session_id, value, expiry, agent, ip) 
    values('$session_id', '$session_data', '$session_expire', '$user_agent', '$client_ip')");
  }
  return true;
 }
 /**
  * session 更新 私有
  * */
 private static function update() 
 {
  if (!self::$is_update) 
  {
   $session_id = self::$session_id;
   $session_expire = TIME + self::get_gc_maxtime();
   self::$dbo->query("update ".self::$table." set expiry='$session_expire' where session_id='$session_id'");
  }
  self::$is_update = TRUE;
 }
 private static function close() 
 {
  if (!self::$is_gc && mt_rand(1, self::$gc_rate_de)%self::$gc_rate_co == 0) 
  {
   self::gc();
  }
  self::$is_gc = TRUE;
 }
 /**
  * 过期session 清除 随机触发
  * */
 private static function gc() 
 {
  $session_expire = TIME - self::get_gc_maxtime();
   self::$dbo->query("delete from ".self::$table." where expiry<'$session_expire'");
 }
 private static function get_session_id() 
 {
  if (isset($_COOKIE['WBSID']) && strlen($_COOKIE['WBSID'])==32) 
  {
   $sid = $_COOKIE['WBSID'];
   setcookie('WBSID', $sid, TIME + self::get_gc_maxtime(), self::$path, self::$domain, self::$secure, self::$httponly);
   return $sid;
  }
  return null;
 }
 private static function create_session_id() 
 {
  $sid = self::get_session_id();
  if (!$sid) 
  {
   $sid = Fun::getIp() . TIME . microtime(TRUE) . mt_rand(mt_rand(0, 100), mt_rand(100000, 90000000));
   $sid = md5(self::$pre_key . $sid);
   setcookie('WBSID', substr($sid, 0, 32), TIME + self::get_gc_maxtime(), self::$path, self::$domain, self::$secure, self::$httponly);
  }
  return $sid;
 }
 public static function get_gc_maxtime()
 {
  return self::$gc_max_time;
 }
}

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