<?php
function mysession_open($save_path, $session_name)
{
@mysql_connect("localhost", "root","1981427") //選擇數(shù)據(jù)庫之前需要先連接數(shù)據(jù)庫服務(wù)器
or die("數(shù)據(jù)庫服務(wù)器連接失敗");
@mysql_select_db("test") //選擇數(shù)據(jù)庫mydb
or die("數(shù)據(jù)庫不存在或不可用");
return true;
}

function mysession_close()
{
return true;
}

function mysession_read($key)
{
@mysql_connect("localhost", "root","1981427") //選擇數(shù)據(jù)庫之前需要先連接數(shù)據(jù)庫服務(wù)器
or die("數(shù)據(jù)庫服務(wù)器連接失敗");
@mysql_select_db("test") //選擇數(shù)據(jù)庫mydb
or die("數(shù)據(jù)庫不存在或不可用");
$expiry_time = time(); //獲取Session失效時間
//執(zhí)行SQL語句獲得Session的值
$query = @mysql_query("select session_data from mysession "
."where session_key = '$key' and session_expiry > $expiry_time")
or die("SQL語句執(zhí)行失敗");
if($row = mysql_fetch_array($query))
return $row['session_data'];
else
return false;
}

function mysession_write($key, $data)
{
@mysql_connect("localhost", "root","1981427") //選擇數(shù)據(jù)庫之前需要先連接數(shù)據(jù)庫服務(wù)器
or die("數(shù)據(jù)庫服務(wù)器連接失敗");
@mysql_select_db("test") //選擇數(shù)據(jù)庫mydb
or die("數(shù)據(jù)庫不存在或不可用");
$expiry_time = time() + 1200; //獲取Session失效時間
//查詢Session的鍵值是否已經(jīng)存在
$query = @mysql_query("select session_data from mysession "
."where session_key = '$key'")
or die("SQL語句執(zhí)行失敗");
//如果不存在，則執(zhí)行插入操作，否則執(zhí)行更新操作
if(mysql_numrows($query) == 0)
{
//執(zhí)行SQL語句插入Session的值
$query = @mysql_query("insert into mysession values('$key', '$data', $expiry_time)")
or die("SQL語句執(zhí)行失敗");
}
else
{
//執(zhí)行SQL語句更新Session的值
$query = @mysql_query("update mysession set "
."session_data = '$data', session_expiry = $expiry_time "
."where session_key = '$key'")
or die("SQL語句執(zhí)行失敗");
}
return $query;
}

function mysession_destroy($key)
{
@mysql_connect("localhost", "root","1981427") //選擇數(shù)據(jù)庫之前需要先連接數(shù)據(jù)庫服務(wù)器
or die("數(shù)據(jù)庫服務(wù)器連接失敗");
@mysql_select_db("test") //選擇數(shù)據(jù)庫mydb
or die("數(shù)據(jù)庫不存在或不可用");
//執(zhí)行SQL語句刪除Session
$query = @mysql_query("delete from mysession where session_key = '$key'")
or die("SQL語句執(zhí)行失敗");
return $query;
}

function mysession_gc($expiry_time)
{
@mysql_connect("localhost", "root","1981427") //選擇數(shù)據(jù)庫之前需要先連接數(shù)據(jù)庫服務(wù)器
or die("數(shù)據(jù)庫服務(wù)器連接失敗");
@mysql_select_db("test") //選擇數(shù)據(jù)庫mydb
or die("數(shù)據(jù)庫不存在或不可用");
$expiry_time = time();
//執(zhí)行SQL語句刪除Session
$query = @mysql_query("delete from mysession where session_expiry < $expiry_time")
or die("SQL語句執(zhí)行失敗");
return $query;
}

//設(shè)置用戶自定義Session存儲
session_set_save_handler('mysession_open',
'mysession_close',
'mysession_read',
'mysession_write',
'mysession_destroy',
'mysession_gc');
?>

<?php
include('user-define-session-inc.php'); //包含session_set_save_handler定義的文件

session_start();
$_SESSION['username'] = "zhuzhao";
$_SESSION['password'] = "123456";
?>

<?php
include('user-define-session-inc.php'); //包含session_set_save_handler定義的文件

session_start();
echo "UserName:".$_SESSION['username']."<BR>";
echo "PassWord:".$_SESSION['password']."<BR>";
?>