首先要进行的配置如下:
1.php.ini中将session.save_handler = files 中的files改为User,其他默认即可,重启Apache
2.本实例创建的数据库名叫php, username: root password:root
本实例设计的数据库的表结构如下所示,代码如下:
- create table mysession(
- session_key char(32) not null,
- session_data text,
- session_expiry int(11),
- primary key(session_key)
- );
第一列表示存储session ID,第二列存储session中的数据,第三列存储有效期,下面就是关键的那份自定义函数的实现session_set_save_handler(......),代码如下:
user-define-session-inc.php
- function mysession_open($save_path, $session_name)
- {
- @mysql_connect("localhost", "root", "root") or die("数据库服务器连接失败");
- @mysql_select_db("php") or die("数据库不存在或不可用");
- return true;
- }
- function mysession_close()
- {
- return true;
- }
- function mysession_read($key)
- {
- @mysql_connect("localhost", "root", "root") or die("数据库服务器连接失败");
- @mysql_select_db("php") or die("数据库不存在或不可用");
- $expiry_time = time();
- $query = @mysql_query("select session_data from mysession where session_key = '$key' and session_expiry > $expiry_time") or die("SQL语句执行失败");
- if($row = mysql_fetch_array($query))
- return $row['session_data'];
- else
- return false;
- }
- function mysession_write($key, $data)
- {
- @mysql_connect("localhost", "root", "root") or die("数据库服务器连接失败");
- @mysql_select_db("php") or die("数据库不存在或不可用");
- $expiry_time = time() + 1200;
- $query = @mysql_query("select session_data from mysession where session_key = '$key'") or die("SQL语句执行失败");
- if(mysql_numrows($query) == 0)
- {
- $query = @mysql_query("insert into mysession values('$key', '$data', $expiry_time)") or die("SQL语句执行失败");
- }
- else
- {
- $query = @mysql_query("update mysession set session_data = '$data', session_expiry = $expiry_time where session_key = '$key'") or die("SQL语句执行失败");
- }
- return $query;
- }
- function mysession_destroy($key)
- {
- @mysql_connect("localhost", "root", "root") or die("数据库服务器连接失败");
- @mysql_select_db("php") or die("数据库不存在或不可用");
- $query = @mysql_query("delete from mysession where session_key = '$key'")
- or die("SQL语句执行失败");
- return $query;
- }
- function mysession_gc($expiry_time)
- {
- @mysql_connect("localhost", "root", "root") or die("数据库服务器连接失败");
- @mysql_select_db("php") or die("数据库不存在或不可用");
- $expiry_time = time();
- $query = @mysql_query("delete from mysession where session_expiry < $expiry_time") or die("SQL语句执行失败");
- return $query;
- }
- session_set_save_handler('mysession_open','mysession_close','mysession_read','mysession_write','mysession_destroy','mysession_gc');
- ?>
最后面就是测试代码:
1.存储页面 save.php
- include('user-define-session-inc.php');
- session_start();
- $_SESSION['username'] = "Simon";
- $_SESSION['password'] = "123456";
- ?>
2.显示页面 show.php
- include('user-define-session-inc.php');
- session_start();
- echo "UserName:".$_SESSION['username']."
- ";
- echo "PassWord:".$_SESSION['password']."
- ";
- ?>
