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php session 处理类

Jun 13, 2016 am 10:00 AM
php session session information variable deal with storage Tutorial Change user of kind

 
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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