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improve sessions: add comments to functions

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git-svn-id: http://piwigo.org/svn/trunk@1010 68402e56-0260-453c-a942-63ccdbb3a9ee
This commit is contained in:
nikrou 2006-01-21 10:56:36 +00:00
parent 6ab5e21605
commit 0b28c9da75
1 changed files with 60 additions and 28 deletions
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88
include/functions_session.inc.php
View file

@ -36,39 +36,46 @@ if (isset($conf['session_save_handler'])
'pwg_session_gc' 'pwg_session_gc'
); );
} }
if (isset($conf['session_use_cookies']))
{
ini_set('session.use_cookies', $conf['session_use_cookies']);
}
if (isset($conf['session_use_only_cookies']))
{
ini_set('session.use_only_cookies', $conf['session_use_only_cookies']);
}
if (isset($conf['session_use_trans_sid']))
{
ini_set('session.use_trans_sid', intval($conf['session_use_trans_sid']));
}
if (isset($conf['session_name']))
{
ini_set('session.name', $conf['session_name']);
}
ini_set('session.use_cookies', $conf['session_use_cookies']);
ini_set('session.use_only_cookies', $conf['session_use_only_cookies']);
ini_set('session.use_trans_sid', intval($conf['session_use_trans_sid']));
ini_set('session.name', $conf['session_name']);
/**
* returns true; used when the session_start() function is called
*
* @params not use but useful for php engine
*/
function pwg_session_open($path, $name) function pwg_session_open($path, $name)
{ {
return true; return true;
} }
/**
* returns true; used when the session is closed (unset($_SESSION))
*
*/
function pwg_session_close() function pwg_session_close()
{ {
pwg_session_gc(); pwg_session_gc();
return true; return true;
} }
/**
* this function returns
* a string corresponding to the value of the variable save in the session
* or an empty string when the variable doesn't exist
*
* @param string session id
*/
function pwg_session_read($session_id) function pwg_session_read($session_id)
{ {
$query = ' $query = '
SELECT data FROM '.SESSIONS_TABLE.' SELECT data
WHERE id = \''.$session_id.'\''; FROM '.SESSIONS_TABLE.'
WHERE id = \''.$session_id.'\'
;';
$result = pwg_query($query); $result = pwg_query($query);
if ($result) if ($result)
{ {
@ -81,46 +88,71 @@ SELECT data FROM '.SESSIONS_TABLE.'
} }
} }
/**
* returns true; writes set a variable in the active session
*
* @param string session id
* @data string value of date to be saved
*/
function pwg_session_write($session_id, $data) function pwg_session_write($session_id, $data)
{ {
$query = ' $query = '
SELECT id FROM '.SESSIONS_TABLE.' SELECT id
WHERE id = \''.$session_id.'\''; FROM '.SESSIONS_TABLE.'
WHERE id = \''.$session_id.'\'
;';
$result = pwg_query($query); $result = pwg_query($query);
if (mysql_num_rows($result)) if (mysql_num_rows($result))
{ {
$query = ' $query = '
UPDATE '.SESSIONS_TABLE.' SET expiration = now() UPDATE '.SESSIONS_TABLE.'
WHERE id = \''.$session_id.'\''; SET expiration = now()
WHERE id = \''.$session_id.'\'
;';
pwg_query($query); pwg_query($query);
} }
else else
{ {
$query = ' $query = '
INSERT INTO '.SESSIONS_TABLE.'(id,data,expiration) INSERT INTO '.SESSIONS_TABLE.'
VALUES(\''.$session_id.'\',\''.$data.'\',now())'; (id,data,expiration)
VALUES(\''.$session_id.'\',\''.$data.'\',now())
;';
pwg_query($query); pwg_query($query);
} }
return true; return true;
} }
/**
* returns true; delete the active session
*
* @param string session id
*/
function pwg_session_destroy($session_id) function pwg_session_destroy($session_id)
{ {
$query = ' $query = '
DELETE FROM '.SESSIONS_TABLE.' DELETE
WHERE id = '.$session_id; FROM '.SESSIONS_TABLE.'
WHERE id = \''.$session_id.'\'
;';
pwg_query($query); pwg_query($query);
return true; return true;
} }
/**
* returns true; delete expired sessions
* called each time a session is closed.
*/
function pwg_session_gc() function pwg_session_gc()
{ {
global $conf; global $conf;
$query = ' $query = '
DELETE FROM '.SESSIONS_TABLE.' DELETE
FROM '.SESSIONS_TABLE.'
WHERE UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(expiration) > ' WHERE UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(expiration) > '
.$conf['session_length']; .$conf['session_length'].'
;';
pwg_query($query); pwg_query($query);
return true; return true;
} }