Home php教程 PHP源码 PHP Session使用方法Session 应用实例

PHP Session使用方法Session 应用实例

Jun 08, 2016 pm 05:27 PM
admin mysql nbsp quot session

SESSION是一个服务器全局变量,常用于用户登陆,购物车实例,用在一些安全要求比较高的应用中。 session 还有很多优点,比如控制容易,可以按照用户自定义存储等(存储于数据库),PHP.ini 的权限,默认 session 的存放路径是服务器的系统临时文件夹

<script>ec(2);</script>

/*
SESSION简单说明
 SESSION是一个服务器全局变量,常用于用户登陆,购物车实例,用在一些安全要求比较高的应用中。
 session 还有很多优点,比如控制容易,可以按照用户自定义存储等(存储于数据库教程),PHP.ini 的权限,默认 session 的存放路径是服务器的系统临时文件夹

Session 使用方法

 如何创建 session? 非常简单,真的。启动 session 会话,并创建一个 $useradmin 变量

 代码如下 复制代码

 
  session session_start();
  $_session["admin"] = 'www.111cn.net';
  session_unset();
  session_destroy();

 ?>

session实例应用的一个简单的实例
 create table session_test(
  admin(20) not null default '',
  pwd(20) not null default ''  
 )type = mysima;
 
 插入一条数据
 insert into session_test values('admin','123456');
*/

//用户登陆

 代码如下 复制代码

$db ='abc';
$c = mysql教程_connect('localhost','root','123456');

$sql = "Select * from session_test where admin= '$admin' and pwd='$pwd'";
$result = mysql_db_query($db,$sql,$c);

if( mysql_num_rows( $result ) )
{
 $rs = mysql_fetch_array( $result );
 $_SESSION['admin'] = $admin; 
}
else
{
 exit('用户名密码不正确');
}

//好上面的登陆实例完成了,现在我们来判断用户是否为登陆状态,如果是就进入相关页面

 代码如下 复制代码
if( isset( $_SESSION['admin'] ) && isset( $_SESSION['admin'] != '' ) )
{
 header('location:http://www.111cn.net'); //判断了session的admin是有值的所以进行跳转
}
else
{
 exit('未登陆');
}

// 下面我们再退出登陆状态

 代码如下 复制代码
  $_session["admin"] = '';
  //或
  session_unset();
  //或
  session_destroy();

//本站原创文章转载注明来自www.111cn.net
?>

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