Witam,
po malu staram sie rozkminiac session handlera ktorego mam z phpclasses. Mam kilka pytań.
Po zalożaniu sesji w bazie mysql pojawia sie expire-date ta data sie jednak nie zmienia wiec czemu ma sluzyc ? (pobiera czas sesji i co z tym ?)
".(time() + $this->sessionLifetime)."
odwolanie do tego:
// get session lifetime
$this->sessionLifetime = ini_get("session.gc_maxlifetime");
Potem nastepnie mama:
session_set_save_handler w tym read write open closed itp. Jak do tych funkcji odwolac sie z poziomu strony ?
bo dzieki funkcji read($session_id) moge wyczytac dane ktora mam w session-data czyli dane ktore zapisze $_SESSION['data']= 'x' np.
chciałbym bardziej zrozumieć dzialanie tego typu obslugi sesji.
Nie wiem jak je sprawdzac po stronie klienta bo w login.php tworze obiekt sesji zapisuje do niego dane ale np. na stronie zalogowany.php nie wiem jak do nich sie odwolac ?SESSIOn handler:
<?php
require_once ("class_connect_db.php");
class dbSession
{
function dbSession($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
$this->sessionLifetime = ini_get("session.gc_maxlifetime");
// register the new handler
array(&$this, 'destroy'), );
register_shutdown_function('session_write_close');
// start the session
}
/**
* Deletes all data related to the session
*
* @return void
*/
function stop()
{
$this->regenerate_id();
}
/**
* Regenerates the session id.
*
* <b>Call this method whenever you do a privilege change!</b>
*
* @return void
*/
function regenerate_id()
{
// saves the old session's 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
// because the session_regenerate_id() function does not delete the old session,
// we have to delete it manually
$this->destroy($oldSessionID);
}
/**
* Get the number of online users
*
* This is not 100% accurate. It depends on how often the garbage collector is run
*
* @return integer approximate number of users currently online
*/
function get_users_online()
{
// counts the rows from the database
SELECT
COUNT(session_id) as count
FROM session_data
"));
// return the number of found rows
return $result["count"];
}
/**
* Custom open() function
*
* @access private
*/
function open($save_path, $session_name)
{
return true;
}
/**
* Custom close() function
*
* @access private
*/
function close()
{
return true;
}
/**
* Custom read() function
*
* @access private
*/
function read($session_id)
{
// reads session data associated with the session id
// but only if the HTTP_USER_AGENT is the same as the one who had previously written to this session
// and if session has not expired
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
// return found data
// don't bother with the unserialization - PHP handles this automatically
return $fields["session_data"];
}
// if there was an error return an empty string - this HAS to be an empty string
return "";
}
/**
* Custom write() function
*
* @access private
*/
function write($session_id, $session_data)
{
// first checks if there is a session with this id
SELECT
*
FROM
session_data
WHERE
session_id = '".$session_id."'
");
// if there is
// update the existing session's data
// and set new expiry time
UPDATE
session_data
SET
session_data = '".$session_data."',
session_expire = '".(time() + $this->sessionLifetime)."' WHERE
session_id = '".$session_id."'
");
// if anything happened
// return true
return true;
}
// if this session id is not in the database
} else {
// insert a new record
INSERT INTO
session_data
(
session_id,
http_user_agent,
session_data,
session_expire
)
VALUES
(
'".$session_id."',
'".$_SERVER["HTTP_USER_AGENT"]."',
'".$session_data."',
'".(time() + $this->sessionLifetime)."' )
");
// if anything happened
// return an empty string
return "";
}
}
// if something went wrong, return false
return false;
}
/**
* Custom destroy() function
*
* @access private
*/
function destroy($session_id)
{
// deletes the current session id from the database
DELETE FROM
session_data
WHERE
session_id = '".$session_id."'
");
// if anything happened
// return true
return true;
}
// if something went wrong, return false
return false;
}
/**
* Custom gc() function (garbage collector)
*
* @access private
*/
function gc($maxlifetime)
{
// it deletes expired sessions from database
DELETE FROM
session_data
WHERE
session_expire < '".(time() - $maxlifetime)."' ");
}
}
?>
Ten post edytował tabbi 17.11.2010, 20:28:10
Session handler pomoc
17.11.2010, 20:27:24
tabbi Session handler pomoc 17.11.2010, 20:27:24 
