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Latest version of ADODB is available at http://php.weblogs.com/adodb
======================================================================
This file provides PHP4 session management using the ADODB database
wrapper library.
Example
=======
include('adodb.inc.php');
#---------------------------------#
include('adodb-cryptsession.php');
#---------------------------------#
session_start();
$_SESSION['AVAR'] += 1;
print "
-- \$_SESSION['AVAR']={$_SESSION['AVAR']}";
Installation
============
1. Create a new database in MySQL or Access "sessions" like
so:
create table sessions (
SESSKEY char(32) not null,
EXPIRY int(11) unsigned not null,
EXPIREREF varchar(64),
DATA CLOB,
primary key (sesskey)
);
2. Then define the following parameters. You can either modify
this file, or define them before this file is included:
$ADODB_SESSION_DRIVER='database driver, eg. mysql or ibase';
$ADODB_SESSION_CONNECT='server to connect to';
$ADODB_SESSION_USER ='user';
$ADODB_SESSION_PWD ='password';
$ADODB_SESSION_DB ='database';
$ADODB_SESSION_TBL = 'sessions'
3. Recommended is PHP 4.0.2 or later. There are documented
session bugs in earlier versions of PHP.
*/
include_once('crypt.inc.php');
if (!defined('_ADODB_LAYER')) {
include (dirname(__FILE__).'/adodb.inc.php');
}
/* if database time and system time is difference is greater than this, then give warning */
define('ADODB_SESSION_SYNCH_SECS',60);
if (!defined('ADODB_SESSION')) {
define('ADODB_SESSION',1);
GLOBAL $ADODB_SESSION_CONNECT,
$ADODB_SESSION_DRIVER,
$ADODB_SESSION_USER,
$ADODB_SESSION_PWD,
$ADODB_SESSION_DB,
$ADODB_SESS_CONN,
$ADODB_SESS_LIFE,
$ADODB_SESS_DEBUG,
$ADODB_SESS_INSERT,
$ADODB_SESSION_EXPIRE_NOTIFY,
$ADODB_SESSION_TBL;
//$ADODB_SESS_DEBUG = true;
/* SET THE FOLLOWING PARAMETERS */
if (empty($ADODB_SESSION_DRIVER)) {
$ADODB_SESSION_DRIVER='mysql';
$ADODB_SESSION_CONNECT='localhost';
$ADODB_SESSION_USER ='root';
$ADODB_SESSION_PWD ='';
$ADODB_SESSION_DB ='xphplens_2';
}
if (empty($ADODB_SESSION_TBL)){
$ADODB_SESSION_TBL = 'sessions';
}
if (empty($ADODB_SESSION_EXPIRE_NOTIFY)) {
$ADODB_SESSION_EXPIRE_NOTIFY = false;
}
function ADODB_Session_Key()
{
$ADODB_CRYPT_KEY = 'CRYPTED ADODB SESSIONS ROCK!';
/* USE THIS FUNCTION TO CREATE THE ENCRYPTION KEY FOR CRYPTED SESSIONS */
/* Crypt the used key, $ADODB_CRYPT_KEY as key and session_ID as SALT */
return crypt($ADODB_CRYPT_KEY, session_ID());
}
$ADODB_SESS_LIFE = ini_get('session.gc_maxlifetime');
if ($ADODB_SESS_LIFE <= 1) {
// bug in PHP 4.0.3 pl 1 -- how about other versions?
//print "Session Error: PHP.INI setting session.gc_maxlifetimenot set: $ADODB_SESS_LIFE
";
$ADODB_SESS_LIFE=1440;
}
function adodb_sess_open($save_path, $session_name)
{
GLOBAL $ADODB_SESSION_CONNECT,
$ADODB_SESSION_DRIVER,
$ADODB_SESSION_USER,
$ADODB_SESSION_PWD,
$ADODB_SESSION_DB,
$ADODB_SESS_CONN,
$ADODB_SESS_DEBUG;
$ADODB_SESS_INSERT = false;
if (isset($ADODB_SESS_CONN)) return true;
$ADODB_SESS_CONN = ADONewConnection($ADODB_SESSION_DRIVER);
if (!empty($ADODB_SESS_DEBUG)) {
$ADODB_SESS_CONN->debug = true;
print" conn=$ADODB_SESSION_CONNECT user=$ADODB_SESSION_USER pwd=$ADODB_SESSION_PWD db=$ADODB_SESSION_DB ";
}
return $ADODB_SESS_CONN->PConnect($ADODB_SESSION_CONNECT,
$ADODB_SESSION_USER,$ADODB_SESSION_PWD,$ADODB_SESSION_DB);
}
function adodb_sess_close()
{
global $ADODB_SESS_CONN;
if ($ADODB_SESS_CONN) $ADODB_SESS_CONN->Close();
return true;
}
function adodb_sess_read($key)
{
$Crypt = new MD5Crypt;
global $ADODB_SESS_CONN,$ADODB_SESS_INSERT,$ADODB_SESSION_TBL;
$rs = $ADODB_SESS_CONN->Execute("SELECT data FROM $ADODB_SESSION_TBL WHERE sesskey = '$key' AND expiry >= " . time());
if ($rs) {
if ($rs->EOF) {
$ADODB_SESS_INSERT = true;
$v = '';
} else {
// Decrypt session data
$v = rawurldecode($Crypt->Decrypt(reset($rs->fields), ADODB_Session_Key()));
}
$rs->Close();
return $v;
}
else $ADODB_SESS_INSERT = true;
return '';
}
function adodb_sess_write($key, $val)
{
$Crypt = new MD5Crypt;
global $ADODB_SESS_INSERT,$ADODB_SESS_CONN, $ADODB_SESS_LIFE, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY;
$expiry = time() + $ADODB_SESS_LIFE;
// encrypt session data..
$val = $Crypt->Encrypt(rawurlencode($val), ADODB_Session_Key());
$arr = array('sesskey' => $key, 'expiry' => $expiry, 'data' => $val);
if ($ADODB_SESSION_EXPIRE_NOTIFY) {
$var = reset($ADODB_SESSION_EXPIRE_NOTIFY);
global $$var;
$arr['expireref'] = $$var;
}
$rs = $ADODB_SESS_CONN->Replace($ADODB_SESSION_TBL,
$arr,
'sesskey',$autoQuote = true);
if (!$rs) {
ADOConnection::outp( '
-- Session Replace: '.$ADODB_SESS_CONN->ErrorMsg().'',false);
} else {
// bug in access driver (could be odbc?) means that info is not commited
// properly unless select statement executed in Win2000
if ($ADODB_SESS_CONN->databaseType == 'access') $rs = $ADODB_SESS_CONN->Execute("select sesskey from $ADODB_SESSION_TBL WHERE sesskey='$key'");
}
return isset($rs);
}
function adodb_sess_destroy($key)
{
global $ADODB_SESS_CONN, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY;
if ($ADODB_SESSION_EXPIRE_NOTIFY) {
reset($ADODB_SESSION_EXPIRE_NOTIFY);
$fn = next($ADODB_SESSION_EXPIRE_NOTIFY);
$savem = $ADODB_SESS_CONN->SetFetchMode(ADODB_FETCH_NUM);
$rs = $ADODB_SESS_CONN->Execute("SELECT expireref,sesskey FROM $ADODB_SESSION_TBL WHERE sesskey='$key'");
$ADODB_SESS_CONN->SetFetchMode($savem);
if ($rs) {
$ADODB_SESS_CONN->BeginTrans();
while (!$rs->EOF) {
$ref = $rs->fields[0];
$key = $rs->fields[1];
$fn($ref,$key);
$del = $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE sesskey='$key'");
$rs->MoveNext();
}
$ADODB_SESS_CONN->CommitTrans();
}
} else {
$qry = "DELETE FROM $ADODB_SESSION_TBL WHERE sesskey = '$key'";
$rs = $ADODB_SESS_CONN->Execute($qry);
}
return $rs ? true : false;
}
function adodb_sess_gc($maxlifetime) {
global $ADODB_SESS_CONN, $ADODB_SESSION_TBL,$ADODB_SESSION_EXPIRE_NOTIFY,$ADODB_SESS_DEBUG;
if ($ADODB_SESSION_EXPIRE_NOTIFY) {
reset($ADODB_SESSION_EXPIRE_NOTIFY);
$fn = next($ADODB_SESSION_EXPIRE_NOTIFY);
$savem = $ADODB_SESS_CONN->SetFetchMode(ADODB_FETCH_NUM);
$t = time();
$rs = $ADODB_SESS_CONN->Execute("SELECT expireref,sesskey FROM $ADODB_SESSION_TBL WHERE expiry < $t");
$ADODB_SESS_CONN->SetFetchMode($savem);
if ($rs) {
$ADODB_SESS_CONN->BeginTrans();
while (!$rs->EOF) {
$ref = $rs->fields[0];
$key = $rs->fields[1];
$fn($ref,$key);
//$del = $ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE sesskey='$key'");
$rs->MoveNext();
}
$rs->Close();
$ADODB_SESS_CONN->Execute("DELETE FROM $ADODB_SESSION_TBL WHERE expiry < $t");
$ADODB_SESS_CONN->CommitTrans();
}
} else {
$qry = "DELETE FROM $ADODB_SESSION_TBL WHERE expiry < " . time();
$ADODB_SESS_CONN->Execute($qry);
}
// suggested by Cameron, "GaM3R"
if (defined('ADODB_SESSION_OPTIMIZE'))
{
global $ADODB_SESSION_DRIVER;
switch( $ADODB_SESSION_DRIVER ) {
case 'mysql':
case 'mysqlt':
$opt_qry = 'OPTIMIZE TABLE '.$ADODB_SESSION_TBL;
break;
case 'postgresql':
case 'postgresql7':
$opt_qry = 'VACUUM '.$ADODB_SESSION_TBL;
break;
}
}
if ($ADODB_SESS_CONN->dataProvider === 'oci8') $sql = 'select TO_CHAR('.($ADODB_SESS_CONN->sysTimeStamp).', \'RRRR-MM-DD HH24:MI:SS\') from '. $ADODB_SESSION_TBL;
else $sql = 'select '.$ADODB_SESS_CONN->sysTimeStamp.' from '. $ADODB_SESSION_TBL;
$rs =& $ADODB_SESS_CONN->SelectLimit($sql,1);
if ($rs && !$rs->EOF) {
$dbts = reset($rs->fields);
$rs->Close();
$dbt = $ADODB_SESS_CONN->UnixTimeStamp($dbts);
$t = time();
if (abs($dbt - $t) >= ADODB_SESSION_SYNCH_SECS) {
$msg =
__FILE__.": Server time for webserver {$_SERVER['HTTP_HOST']} not in synch with database: database=$dbt ($dbts), webserver=$t (diff=".(abs($dbt-$t)/3600)." hrs)";
error_log($msg);
if ($ADODB_SESS_DEBUG) ADOConnection::outp("
-- $msg");
}
}
return true;
}
session_module_name('user');
session_set_save_handler(
"adodb_sess_open",
"adodb_sess_close",
"adodb_sess_read",
"adodb_sess_write",
"adodb_sess_destroy",
"adodb_sess_gc");
}
/* TEST SCRIPT -- UNCOMMENT */
/*
if (0) {
session_start();
$_SESSION['AVAR'] += 1;
print "
-- \$_SESSION['AVAR']={$_SESSION['AVAR']}";
}
*/
?>