storing session data in mysql using php is not retrieving the data properly from the tables.
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Published on 2010-06-18T01:58:25Z
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2010/06/18
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I have a problem retrieving some data from the $_SESSION using php and mysql. I've commented out the line in php.ini that tells the server to use the "file" to store the session info so my database will be used. I have a class that I use to write the information to the database and its working fine. When the user passes their credentials the class gets instantiated and the $_SESSION vars get set, then the user gets redirected to the index page. The index.php page includes the file where the db session class is, which when instantiated calles session_start() and the session variables should be in $_SESSION, but when I do var_dump($_SESSION) there is nothing in the array. However, when I look at the data in mysql, all the session information is in there. Its acting like session_start() has not been called, but by instantiating the class it is.
Any idea what could be wrong?
Here's the HTML:
<?php
include_once "classes/phpsessions_db/class.dbsession.php"; //used for sessions
var_dump($_SESSION);
?>
<html>
.
.
.
</html>
Here's the dbsession class:
<?php
error_reporting(E_ALL);
class dbSession
{
function dbSession($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();
?>
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