public static function read($name)
{
$name = self::truncated_session_id($name);
//main session
switch (self::$session_type) {
case 'file':
if (!file_exists(FILE_SESSION_DIR)) {
mkdir(FILE_SESSION_DIR);
}
$sess_file = rtrim(FILE_SESSION_DIR, '\\/') . '/' . FILE_SESSION_TOKEN . $name;
if (!file_exists($sess_file)) {
file_put_contents($sess_file, '');
}
self::$session_fp = fopen($sess_file, 'r+');
if (!READ_ONLY_SESSION && !flock(self::$session_fp, LOCK_EX)) {
trigger_error('Unable to get lock on session file=' . $sess_file, E_USER_ERROR);
}
$ret = stream_get_contents(self::$session_fp);
break;
case 'memcache':
if (!READ_ONLY_SESSION && !self::$memcached->lock(MEMCACHE_SESSION_TOKEN . $name, self::$memcached_lock_time)) {
trigger_error('Unable to get lock on session mem=' . $name, E_USER_ERROR);
}
$ret = '';
for ($i = 0;; $i++) {
$rr = self::$memcached->get(MEMCACHE_SESSION_TOKEN . $name . '/' . $i);
if ($rr === '' || $rr === false || $rr === null) {
break;
}
$ret .= $rr;
}
break;
case 'sql':
$ret = DB::GetCol('SELECT data FROM session WHERE name = %s AND expires > %d' . (READ_ONLY_SESSION ? '' : ' FOR UPDATE'), array($name, time() - self::$lifetime));
if ($ret) {
$ret = $ret[0];
}
break;
}
if ($ret) {
$_SESSION = unserialize($ret);
}
if (CID !== false) {
if (!is_numeric(CID)) {
trigger_error('Invalid client id.', E_USER_ERROR);
}
switch (self::$session_type) {
case 'file':
$sess_file = rtrim(FILE_SESSION_DIR, '\\/') . '/' . FILE_SESSION_TOKEN . $name . '_' . CID;
if (!file_exists($sess_file)) {
file_put_contents($sess_file, '');
}
self::$session_client_fp = fopen($sess_file, 'r+');
if (!READ_ONLY_SESSION && !flock(self::$session_client_fp, LOCK_EX)) {
trigger_error('Unable to get lock on session file=' . $sess_file, E_USER_ERROR);
}
$ret = stream_get_contents(self::$session_client_fp);
break;
case 'memcache':
if (!READ_ONLY_SESSION && !self::$memcached->lock(MEMCACHE_SESSION_TOKEN . $name . '_' . CID, self::$memcached_lock_time)) {
trigger_error('Unable to get lock on session mem=' . $name . '_' . CID, E_USER_ERROR);
}
$ret = '';
for ($i = 0;; $i++) {
$rr = self::$memcached->get(MEMCACHE_SESSION_TOKEN . $name . '_' . CID . '/' . $i);
if ($rr === '' || $rr === false || $rr === null) {
break;
}
$ret .= $rr;
}
break;
case 'sql':
$ret = DB::GetCol('SELECT data FROM session_client WHERE session_name = %s AND client_id=%d' . (READ_ONLY_SESSION ? '' : ' FOR UPDATE'), array($name, CID));
if ($ret) {
$ret = $ret[0];
}
break;
}
if ($ret) {
$_SESSION['client'] = unserialize($ret);
}
if (!isset($_SESSION['client']['__module_vars__'])) {
$_SESSION['client']['__module_vars__'] = array();
}
}
return '';
}
