php基于session实现数据库交互的类实例

2024-05-04 23:38:32

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这篇文章主要介绍了php基于session实现数据库交互的类,实例分析了php结合session操作数据库的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了php基于session实现数据库交互的类。分享给大家供大家参考。具体如下：

<?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']) ? 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']) ? 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;

}

}