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我有一个问题，使用php和mysql从$ _SESSION中检索一些数据。我在php.ini中注释了这一行，告诉服务器使用“文件”存储会话信息，以便使用我的数据库。我有一个类用于将信息写入数据库并且工作正常。当用户传递凭证时，类将被实例化，$ _SESSION变量被设置，然后用户被重定向到索引页面。 index.php页面包含db会话类所在的文件，当实例化calles session_start（）和会话变量应该在$ _SESSION中时，但当我做var_dump（$ _ SESSION）时，数组中没有任何内容。但是，当我查看mysql中的数据时，所有会话信息都在那里。它的行为像session_start（）没有被调用，但通过实例化它的类。在mysql中使用php存储会话数据没有从表中正确检索数据
任何想法可能是错误的？
这里的HTML：
<?php
include_once "classes/phpsessions_db/class.dbsession.php"; //used for sessions
var_dump($_SESSION);
?>
<html>
.
.
.
</html>
这里的dbsession类：
<?php
error_reporting(E_ALL);
class dbSession
{
function dbSession($gc_maxlifetime = "", $gc_probability = "", $gc_divisor = "")
{
// if $gc_maxlifetime is specified and is an integer number
if ($gc_maxlifetime != "" && is_integer($gc_maxlifetime)) {
// set the new value
@ini_set('session.gc_maxlifetime', $gc_maxlifetime);
}
// if $gc_probability is specified and is an integer number
if ($gc_probability != "" && is_integer($gc_probability)) {
// set the new value
@ini_set('session.gc_probability', $gc_probability);
}
// if $gc_divisor is specified and is an integer number
if ($gc_divisor != "" && is_integer($gc_divisor)) {
// set the new value
@ini_set('session.gc_divisor', $gc_divisor);
}
// get session lifetime
$this->sessionLifetime = ini_get("session.gc_maxlifetime");
//Added by AARON. cancel the session's auto start,important, without this the session var's don't show up on next pg.
session_write_close();
// register the new handler
session_set_save_handler(
array(&$this, 'open'),
array(&$this, 'close'),
array(&$this, 'read'),
array(&$this, 'write'),
array(&$this, 'destroy'),
array(&$this, 'gc')
);
register_shutdown_function('session_write_close');
// start the session
@session_start();
}
function stop()
{
$new_sess_id = $this->regenerate_id(true);
session_unset();
session_destroy();
return $new_sess_id;
}
function regenerate_id($return_val=false)
{
// saves the old session's id
$oldSessionID = session_id();
// regenerates the id
// this function will create a new session, with a new id and containing the data from the old session
// but will not delete the old session
session_regenerate_id();
// because the session_regenerate_id() function does not delete the old session,
// we have to delete it manually
//$this->destroy($oldSessionID);
//ADDED by aaron
// returns the new session id
if($return_val)
{
return session_id();
}
}
function open($save_path, $session_name)
{
// global $gf;
// $gf->debug_this($gf, "GF: Opening Session");
// change the next values to match the setting of your mySQL database
$mySQLHost = "localhost";
$mySQLUsername = "user";
$mySQLPassword = "pass";
$mySQLDatabase = "sessions";
$link = mysql_connect($mySQLHost, $mySQLUsername, $mySQLPassword);
if (!$link) {
die ("Could not connect to database!");
}
$dbc = mysql_select_db($mySQLDatabase, $link);
if (!$dbc) {
die ("Could not select database!");
}
return true;
}
function close()
{
mysql_close();
return true;
}
function read($session_id)
{
$result = @mysql_query("
SELECT
session_data
FROM
session_data
WHERE
session_id = '".$session_id."' AND
http_user_agent = '".$_SERVER["HTTP_USER_AGENT"]."' AND
session_expire > '".time()."'
");
// if anything was found
if (is_resource($result) && @mysql_num_rows($result) > 0) {
// return found data
$fields = @mysql_fetch_assoc($result);
// don't bother with the unserialization - PHP handles this automatically
return unserialize($fields["session_data"]);
}
// if there was an error return an empty string - this HAS to be an empty string
return "";
}
function write($session_id, $session_data)
{
// global $gf;
// first checks if there is a session with this id
$result = @mysql_query("
SELECT
*
FROM
session_data
WHERE
session_id = '".$session_id."'
");
// if there is
if (@mysql_num_rows($result) > 0)
{
// update the existing session's data
// and set new expiry time
$result = @mysql_query("
UPDATE
session_data
SET
session_data = '".serialize($session_data)."',
session_expire = '".(time() + $this->sessionLifetime)."'
WHERE
session_id = '".$session_id."'
");
// if anything happened
if (@mysql_affected_rows())
{
// return true
return true;
}
}
else // if this session id is not in the database
{
// $gf->debug_this($gf, "inside dbSession, trying to write to db because session id was NOT in db");
$sql = "
INSERT INTO
session_data
(
session_id,
http_user_agent,
session_data,
session_expire
)
VALUES
(
'".serialize($session_id)."',
'".$_SERVER["HTTP_USER_AGENT"]."',
'".$session_data."',
'".(time() + $this->sessionLifetime)."'
)
";
// insert a new record
$result = @mysql_query($sql);
// if anything happened
if (@mysql_affected_rows())
{
// return an empty string
return "";
}
}
// if something went wrong, return false
return false;
}
function destroy($session_id)
{
// deletes the current session id from the database
$result = @mysql_query("
DELETE FROM
session_data
WHERE
session_id = '".$session_id."'
");
// if anything happened
if (@mysql_affected_rows()) {
// return true
return true;
}
// if something went wrong, return false
return false;
}
function gc($maxlifetime)
{
// it deletes expired sessions from database
$result = @mysql_query("
DELETE FROM
session_data
WHERE
session_expire < '".(time() - $maxlifetime)."'
");
}
} //End of Class
$session = new dbsession();
?>
谢谢，我在phpclasses.org上找到了这个类并修改了它供我使用。我想，当我在一个月前尝试其他的东西时，我在那里留下了那个反序列化（）。一旦我删除了它，并删除了它的任何序列化的东西。由于你是对的，因此信用证会送给你，而且我更喜欢你的Replace Into代码。谢谢你的帮助！ – Ronedog 2010-06-18 23:21:18