php session 处理类
php教程 session 变量用于存储有关用户会话的信息,或更改用户会话的设置。session 变量保存的信息是单一用户的,并且可供应用程序中的所有页面使用。
php session 变量
当您运行一个应用程序时,您会打开它,做些更改,然后关闭它。这很像一次会话。计算机清楚你是谁。它知道你何时启动应用程序,并在何时终止。但是在因特网上,存在一个问题:服务器不知道你是谁以及你做什么,这是由于 http 地址不能维持状态。
通过在服务器上存储用户信息以便随后使用,php session 解决了这个问题(比如用户名称、购买商品等)。不过,会话信息是临时的,在用户离开网站后将被删除。如果您需要永久储存信息,可以把数据存储在数据库教程中。
session 的工作机制是:为每个访问者创建一个唯一的 id (uid),并基于这个 uid 来存储变量。uid 存储在 cookie 中,亦或通过 url 进行传导。
*/
class my_session
{
function my_session()
{
// destroy sessions started with session.auto_start
if( session_id() )
{
session_unset();
session_destroy();
}
session_start();
}function set($name, $value)
{
$_session[$name] = $value;
}function get($name)
{
if(isset($_session[$name]))
return $_session[$name];
else
return false;
}function del($name)
{
unset($_session[$name]);
}function destroy()
{
$_session = array();
session_destroy();
}
}

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