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	diff --git a/appinfo/info.xml b/appinfo/info.xml
	--- a/appinfo/info.xml
	+++ b/appinfo/info.xml
	@@ -1,18 +1,18 @@
	<?xml version="1.0"?>
	<info>
	<id>user_sql</id>
	<name>SQL user backend</name>
	<description>Authenticate Users by SQL</description>
	<licence>AGPL</licence>
	<author>Andreas Boehler <dev (at) aboehler
	(dot) at ></author>
	- <version>2.2</version>
	+ <version>2.3</version>
	<shipped>false</shipped>
	<namespace>user_sql</namespace>
	<types>
	<authentication/>
	</types>
	<dependencies>
	<owncloud min-version="8.1" max-version="9"/>
	</dependencies>
	</info>
	diff --git a/user_sql.php b/user_sql.php
	--- a/user_sql.php
	+++ b/user_sql.php
	@@ -1,775 +1,775 @@
	<?php

	/**
	* ownCloud - user_sql
	*
	* @author Andreas Böhler and contributors
	* @copyright 2012-2015 Andreas Böhler <dev (at) aboehler (dot) at>
	*
	* credits go to Ed W for several SQL injection fixes and caching support
	* credits go to Frédéric France for providing Joomla support
	* credits go to Mark Jansenn for providing Joomla 2.5.18+ / 3.2.1+ support
	* credits go to Dominik Grothaus for providing SSHA256 support and fixing a few bugs
	* credits go to Sören Eberhardt-Biermann for providing multi-host support
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
	* License as published by the Free Software Foundation; either
	* version 3 of the License, or any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
	*
	* You should have received a copy of the GNU Affero General Public
	* License along with this library. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	namespace OCA\user_sql;

	use \OCA\user_sql\lib\Helper;

	class OC_USER_SQL extends \OC_User_Backend implements \OCP\IUserBackend, \OCP\UserInterface
	{
	protected $cache;
	protected $settings;
	protected $helper;
	protected $session_cache_name;

	/**
	* The default constructor. It loads the settings for the given domain
	* and tries to connect to the database.
	*/
	public function __construct()
	{
	$memcache = \OC::$server->getMemCacheFactory();
	if ( $memcache -> isAvailable())
	{
	$this -> cache = $memcache -> create();
	}
	$this -> helper = new \OCA\user_sql\lib\Helper();
	$domain = \OC::$server->getRequest()->getServerHost();
	$this -> settings = $this -> helper -> loadSettingsForDomain($domain);
	$this -> helper -> connectToDb($this -> settings);
	$this -> session_cache_name = 'USER_SQL_CACHE';
	return false;
	}

	/**
	* Sync the user's E-Mail address with the address stored by ownCloud.
	* We have three (four) sync modes:
	* - none: Does nothing
	* - initial: Do the sync only once from SQL -> ownCloud
	* - forcesql: The SQL database always wins and sync to ownCloud
	* - forceoc: ownCloud always wins and syncs to SQL
	*
	* @param string $uid The user's ID to sync
	* @return bool Success or Fail
	*/
	private function doEmailSync($uid)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Entering doEmailSync for UID: $uid", \OCP\Util::DEBUG);
	if($this -> settings['col_email'] === '')
	return false;

	if($this -> settings['set_mail_sync_mode'] === 'none')
	return false;

	$ocUid = $uid;
	$uid = $this -> doUserDomainMapping($uid);

	$row = $this -> helper -> runQuery('getMail', array('uid' => $uid));
	if($row === false)
	{
	return false;
	}
	$newMail = $row[$this -> settings['col_email']];
	$currMail = \OCP\Config::getUserValue($ocUid, 'settings', 'email', '');

	switch($this -> settings['set_mail_sync_mode'])
	{
	case 'initial':
	if($currMail === '')
	\OCP\Config::setUserValue($ocUid, 'settings', 'email', $newMail);
	break;
	case 'forcesql':
	if($currMail !== $newMail)
	\OCP\Config::setUserValue($ocUid, 'settings', 'email', $newMail);
	break;
	case 'forceoc':
	if(($currMail !== '') && ($currMail !== $newMail))
	{
	$row = $this -> helper -> runQuery('setMail', array('uid' => $uid, 'currMail' => $currMail), true);

	if($row === false)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Could not update E-Mail address in SQL database!", \OCP\Util::ERROR);
	}
	}
	break;
	}

	return true;
	}

	/**
	* This maps the username to the specified domain name.
	* It can only append a default domain name.
	*
	* @param string $uid The UID to work with
	* @return string The mapped UID
	*/
	private function doUserDomainMapping($uid)
	{
	$uid = trim($uid);

	if($this -> settings['set_default_domain'] !== '')
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Append default domain: ".$this -> settings['set_default_domain'], \OCP\Util::DEBUG);
	if(strpos($uid, '@') === false)
	{
	$uid .= "@" . $this -> settings['set_default_domain'];
	}
	}

	$uid = strtolower($uid);
	\OCP\Util::writeLog('OC_USER_SQL', 'Returning mapped UID: ' . $uid, \OCP\Util::DEBUG);
	return $uid;
	}

	/**
	* Return the actions implemented by this backend
	* @param $actions
	* @return bool
	*/
	public function implementsAction($actions)
	{
	return (bool)((\OC_User_Backend::CHECK_PASSWORD
	\| \OC_User_Backend::GET_DISPLAYNAME
	\| \OC_User_Backend::COUNT_USERS
	\| $this -> settings['set_allow_pwchange'] === 'true' ? \OC_User_Backend::SET_PASSWORD : 0
	\| $this -> settings['set_enable_gethome'] === 'true' ? \OC_User_Backend::GET_HOME : 0
	) & $actions);
	}

	/**
	* Checks if this backend has user listing support
	* @return bool
	*/
	public function hasUserListings()
	{
	return true;
	}

	/**
	* Return the user's home directory, if enabled
	* @param string $uid The user's ID to retrieve
	* @return mixed The user's home directory or false
	*/
	public function getHome($uid)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Entering getHome for UID: $uid", \OCP\Util::DEBUG);

	if($this -> settings['set_enable_gethome'] !== 'true')
	return false;

	$uidMapped = $this -> doUserDomainMapping($uid);
	$home = false;

	switch($this->settings['set_gethome_mode'])
	{
	case 'query':
	\OCP\Util::writeLog('OC_USER_SQL', "getHome with Query selected, running Query...", \OCP\Util::DEBUG);
	$row = $this -> helper -> runQuery('getHome', array('uid' => $uidMapped));
	if($row === false)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Got no row, return false", \OCP\Util::DEBUG);
	return false;
	}
	$home = $row[$this -> settings['col_gethome']];
	break;

	case 'static':
	\OCP\Util::writeLog('OC_USER_SQL', "getHome with static selected", \OCP\Util::DEBUG);
	$home = $this -> settings['set_gethome'];
	$home = str_replace('%ud', $uidMapped, $home);
	$home = str_replace('%u', $uid, $home);
	$home = str_replace('%d', $this -> settings['set_default_domain'], $home);
	break;
	}
	\OCP\Util::writeLog('OC_USER_SQL', "Returning getHome for UID: $uid with Home $home", \OCP\Util::DEBUG);
	return $home;
	}

	/**
	* Create a new user account using this backend
	* @return bool always false, as we can't create users
	*/
	public function createUser()
	{
	// Can't create user
	\OCP\Util::writeLog('OC_USER_SQL', 'Not possible to create local users from web frontend using SQL user backend', \OCP\Util::ERROR);
	return false;
	}

	/**
	* Delete a user account using this backend
	* @param string $uid The user's ID to delete
	* @return bool always false, as we can't delete users
	*/
	public function deleteUser($uid)
	{
	// Can't delete user
	\OCP\Util::writeLog('OC_USER_SQL', 'Not possible to delete local users from web frontend using SQL user backend', \OCP\Util::ERROR);
	return false;
	}

	/**
	* Set (change) a user password
	* This can be enabled/disabled in the settings (set_allow_pwchange)
	*
	* @param string $uid The user ID
	* @param string $password The user's new password
	* @return bool The return status
	*/
	public function setPassword($uid, $password)
	{
	// Update the user's password - this might affect other services, that
	// use the same database, as well
	\OCP\Util::writeLog('OC_USER_SQL', "Entering setPassword for UID: $uid", \OCP\Util::DEBUG);

	if($this -> settings['set_allow_pwchange'] !== 'true')
	return false;

	$uid = $this -> doUserDomainMapping($uid);

	$row = $this -> helper -> runQuery('getPass', array('uid' => $uid));
	if($row === false)
	{
	return false;
	}
	$old_password = $row[$this -> settings['col_password']];
	if($this -> settings['set_crypt_type'] === 'joomla2')
	{
	if(!class_exists('\PasswordHash'))
	require_once('PasswordHash.php');
	$hasher = new \PasswordHash(10, true);
	$enc_password = $hasher -> HashPassword($password);
	}
	// Redmine stores the salt separatedly, this doesn't play nice with the way
	// we check passwords
	elseif($this -> settings['set_crypt_type'] === 'redmine')
	{
	$salt = $this -> helper -> runQuery('getRedmineSalt', array('uid' => $uid));
	if(!$salt)
	return false;
	$enc_password = sha1($salt['salt'].sha1($password));
	} else
	{
	$enc_password = $this -> pacrypt($password, $old_password);
	}
	$res = $this -> helper -> runQuery('setPass', array('uid' => $uid, 'enc_password' => $enc_password), true);
	if($res === false)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Could not update password!", \OCP\Util::ERROR);
	return false;
	}
	\OCP\Util::writeLog('OC_USER_SQL', "Updated password successfully, return true", \OCP\Util::DEBUG);
	return true;
	}

	/**
	* Check if the password is correct
	* @param string $uid The username
	* @param string $password The password
	* @return bool true/false
	*
	* Check if the password is correct without logging in the user
	*/
	public function checkPassword($uid, $password)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Entering checkPassword() for UID: $uid", \OCP\Util::DEBUG);

	$uid = $this -> doUserDomainMapping($uid);

	$row = $this -> helper -> runQuery('getPass', array('uid' => $uid));
	if($row === false)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Got no row, return false", \OCP\Util::DEBUG);
	return false;
	}
	$db_pass = $row[$this -> settings['col_password']];
	\OCP\Util::writeLog('OC_USER_SQL', "Encrypting and checking password", \OCP\Util::DEBUG);
	// Joomla 2.5.18 switched to phPass, which doesn't play nice with the way
	// we check passwords
	if($this -> settings['set_crypt_type'] === 'joomla2')
	{
	if(!class_exists('\PasswordHash'))
	require_once('PasswordHash.php');
	$hasher = new \PasswordHash(10, true);
	$ret = $hasher -> CheckPassword($password, $db_pass);
	}
	// Redmine stores the salt separatedly, this doesn't play nice with the way
	// we check passwords
	elseif($this -> settings['set_crypt_type'] === 'redmine')
	{
	$salt = $this -> helper -> runQuery('getRedmineSalt', array('uid' => $uid));
	if(!$salt)
	return false;
	$ret = sha1($salt['salt'].sha1($password)) === $db_pass;
	} else
	{
	$ret = $this -> pacrypt($password, $db_pass) === $db_pass;
	}
	if($ret)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Passwords matching, return true", \OCP\Util::DEBUG);
	if($this -> settings['set_strip_domain'] === 'true')
	{
	$uid = explode("@", $uid);
	$uid = $uid[0];
	}
	return $uid;
	} else
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Passwords do not match, return false", \OCP\Util::DEBUG);
	return false;
	}
	}

	/**
	* Count the number of users
	* @return int The user count
	*/
	public function countUsers()
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Entering countUsers()", \OCP\Util::DEBUG);

	$search = "%".$this -> doUserDomainMapping("");
	$userCount = $this -> helper -> runQuery('countUsers', array('search' => $search));
	if($userCount === false)
	{
	$userCount = 0;
	}
	else {
	$userCount = reset($userCount);
	}

	\OCP\Util::writeLog('OC_USER_SQL', "Return usercount: ".$userCount, \OCP\Util::DEBUG);
	return $userCount;
	}

	/**
	* Get a list of all users
	* @param string $search The search term (can be empty)
	* @param int $limit The search limit (can be null)
	* @param int $offset The search offset (can be null)
	* @return array with all uids
	*/
	public function getUsers($search = '', $limit = null, $offset = null)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Entering getUsers() with Search: $search, Limit: $limit, Offset: $offset", \OCP\Util::DEBUG);
	$users = array();

	if($search !== '')
	{
	$search = "%".$this -> doUserDomainMapping($search."%")."%";
	}
	else
	{
	$search = "%".$this -> doUserDomainMapping("")."%";
	}

	$rows = $this -> helper -> runQuery('getUsers', array('search' => $search), false, true, array('limit' => $limit, 'offset' => $offset));
	if($rows === false)
	return array();

	foreach($rows as $row)
	{
	$uid = $row[$this -> settings['col_username']];
	if($this -> settings['set_strip_domain'] === 'true')
	{
	$uid = explode("@", $uid);
	$uid = $uid[0];
	}
	$users[] = strtolower($uid);
	}
	\OCP\Util::writeLog('OC_USER_SQL', "Return list of results", \OCP\Util::DEBUG);
	return $users;
	}

	/**
	* Check if a user exists
	* @param string $uid the username
	* @return boolean
	*/
	public function userExists($uid)
	{

	$cacheKey = 'sql_user_exists_' . $uid;
	$cacheVal = $this -> getCache ($cacheKey);
	\OCP\Util::writeLog('OC_USER_SQL', "userExists() for UID: $uid cacheVal: $cacheVal", \OCP\Util::DEBUG);
	if(!is_null($cacheVal))
	return (bool)$cacheVal;

	\OCP\Util::writeLog('OC_USER_SQL', "Entering userExists() for UID: $uid", \OCP\Util::DEBUG);

	$uid = $this -> doUserDomainMapping($uid);

	$exists = (bool)$this -> helper -> runQuery('userExists', array('uid' => $uid));;
	$this -> setCache ($cacheKey, $exists, 60);

	if(!$exists)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Empty row, user does not exists, return false", \OCP\Util::DEBUG);
	return false;
	} else
	{
	\OCP\Util::writeLog('OC_USER_SQL', "User exists, return true", \OCP\Util::DEBUG);
	return true;
	}

	}

	/**
	* Get the display name of the user
	* @param string $uid The user ID
	* @return mixed The user's display name or FALSE
	*/
	public function getDisplayName($uid)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Entering getDisplayName() for UID: $uid", \OCP\Util::DEBUG);

	$this -> doEmailSync($uid);
	$uid = $this -> doUserDomainMapping($uid);

	if(!$this -> userExists($uid))
	{
	return false;
	}

	$row = $this -> helper -> runQuery('getDisplayName', array('uid' => $uid));

	if(!$row)
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Empty row, user has no display name or does not exist, return false", \OCP\Util::DEBUG);
	return false;
	} else
	{
	\OCP\Util::writeLog('OC_USER_SQL', "User exists, return true", \OCP\Util::DEBUG);
	$displayName = $row[$this -> settings['col_displayname']];
	return $displayName; ;
	}
	return false;
	}

	public function getDisplayNames($search = '', $limit = null, $offset = null)
	{
	$uids = $this -> getUsers($search, $limit, $offset);
	$displayNames = array();
	foreach($uids as $uid)
	{
	$displayNames[$uid] = $this -> getDisplayName($uid);
	}
	return $displayNames;
	}

	/**
	* Returns the backend name
	* @return string
	*/
	public function getBackendName()
	{
	return 'SQL';
	}

	/**
	* The following functions were directly taken from PostfixAdmin and just
	* slightly modified
	* to suit our needs.
	* Encrypt a password, using the apparopriate hashing mechanism as defined in
	* config.inc.php ($this->crypt_type).
	* When wanting to compare one pw to another, it's necessary to provide the
	* salt used - hence
	* the second parameter ($pw_db), which is the existing hash from the DB.
	*
	* @param string $pw cleartext password
	* @param string $pw_db encrypted password from database
	* @return string encrypted password.
	*/
	private function pacrypt($pw, $pw_db = "")
	{
	\OCP\Util::writeLog('OC_USER_SQL', "Entering private pacrypt()", \OCP\Util::DEBUG);
	$pw = stripslashes($pw);
	$password = "";
	$salt = "";

	if($this -> settings['set_crypt_type'] === 'md5crypt')
	{
	$split_salt = preg_split('/\$/', $pw_db);
	if(isset($split_salt[2]))
	{
	$salt = $split_salt[2];
	}
	$password = $this -> md5crypt($pw, $salt);
	} elseif($this -> settings['set_crypt_type'] === 'md5')
	{
	$password = md5($pw);
	} elseif($this -> settings['set_crypt_type'] === 'system')
	{
	// We never generate salts, as user creation is not allowed here
	$password = crypt($pw, $pw_db);
	} elseif($this -> settings['set_crypt_type'] === 'cleartext')
	{
	$password = $pw;
	}

	// See
	// https://sourceforge.net/tracker/?func=detail&atid=937966&aid=1793352&group_id=191583
	// this is apparently useful for pam_mysql etc.
	elseif($this -> settings['set_crypt_type'] === 'mysql_encrypt')
	{
	if($pw_db !== "")
	{
	$salt = substr($pw_db, 0, 2);

	$row = $this -> helper -> runQuery('mysqlEncryptSalt', array('pw' => $pw, 'salt' => $salt));
	} else
	{
	$row = $this -> helper -> runQuery('mysqlEncrypt', array('pw' => $pw));
	}

	if($row === false)
	{
	return false;
	}
	$password = $row[0];
	} elseif($this -> settings['set_crypt_type'] === 'mysql_password')
	{
	- $this -> helper -> runQuery('mysqlPassword', array('pw' => $pw));
	+ $row = $this -> helper -> runQuery('mysqlPassword', array('pw' => $pw));

	if($row === false)
	{
	return false;
	}
	$password = $row[0];
	}

	// The following is by Frédéric France
	elseif($this -> settings['set_crypt_type'] === 'joomla')
	{
	$split_salt = preg_split('/:/', $pw_db);
	if(isset($split_salt[1]))
	{
	$salt = $split_salt[1];
	}
	$password = ($salt) ? md5($pw . $salt) : md5($pw);
	$password .= ':' . $salt;
	}

	elseif($this-> settings['set_crypt_type'] === 'ssha256')
	{
	$salted_password = base64_decode(preg_replace('/{SSHA256}/i','',$pw_db));
	$salt = substr($salted_password,-(strlen($salted_password)-32));
	$password = $this->ssha256($pw,$salt);
	} else
	{
	\OCP\Util::writeLog('OC_USER_SQL', "unknown/invalid crypt_type settings: ".$this->settings['set_crypt_type'], \OCP\Util::ERROR);
	die('unknown/invalid Encryption type setting: ' . $this -> settings['set_crypt_type']);
	}
	\OCP\Util::writeLog('OC_USER_SQL', "pacrypt() done, return", \OCP\Util::DEBUG);
	return $password;
	}

	/**
	* md5crypt
	* Creates MD5 encrypted password
	* @param string $pw The password to encrypt
	* @param string $salt The salt to use
	* @param string $magic ?
	* @return string The encrypted password
	*/

	private function md5crypt($pw, $salt = "", $magic = "")
	{
	$MAGIC = "$1$";

	if($magic === "")
	$magic = $MAGIC;
	if($salt === "")
	$salt = $this -> create_salt();
	$slist = explode("$", $salt);
	if($slist[0] === "1")
	$salt = $slist[1];

	$salt = substr($salt, 0, 8);
	$ctx = $pw . $magic . $salt;
	$final = $this -> pahex2bin(md5($pw . $salt . $pw));

	for($i = strlen($pw); $i > 0; $i -= 16)
	{
	if($i > 16)
	{
	$ctx .= substr($final, 0, 16);
	} else
	{
	$ctx .= substr($final, 0, $i);
	}
	}
	$i = strlen($pw);

	while($i > 0)
	{
	if($i & 1)
	$ctx .= chr(0);
	else
	$ctx .= $pw[0];
	$i = $i>>1;
	}
	$final = $this -> pahex2bin(md5($ctx));

	for($i = 0; $i < 1000; $i++)
	{
	$ctx1 = "";
	if($i & 1)
	{
	$ctx1 .= $pw;
	} else
	{
	$ctx1 .= substr($final, 0, 16);
	}
	if($i % 3)
	$ctx1 .= $salt;
	if($i % 7)
	$ctx1 .= $pw;
	if($i & 1)
	{
	$ctx1 .= substr($final, 0, 16);
	} else
	{
	$ctx1 .= $pw;
	}
	$final = $this -> pahex2bin(md5($ctx1));
	}
	$passwd = "";
	$passwd .= $this -> to64(((ord($final[0])<<16) \| (ord($final[6])<<8) \| (ord($final[12]))), 4);
	$passwd .= $this -> to64(((ord($final[1])<<16) \| (ord($final[7])<<8) \| (ord($final[13]))), 4);
	$passwd .= $this -> to64(((ord($final[2])<<16) \| (ord($final[8])<<8) \| (ord($final[14]))), 4);
	$passwd .= $this -> to64(((ord($final[3])<<16) \| (ord($final[9])<<8) \| (ord($final[15]))), 4);
	$passwd .= $this -> to64(((ord($final[4])<<16) \| (ord($final[10])<<8) \| (ord($final[5]))), 4);
	$passwd .= $this -> to64(ord($final[11]), 2);
	return "$magic$salt\$$passwd";
	}

	/**
	* Create a new salte
	* @return string The salt
	*/
	private function create_salt()
	{
	srand((double) microtime() * 1000000);
	$salt = substr(md5(rand(0, 9999999)), 0, 8);
	return $salt;
	}

	/**
	* Encrypt using SSHA256 algorithm
	* @param string $pw The password
	* @param string $salt The salt to use
	* @return string The hashed password, prefixed by {SSHA256}
	*/
	private function ssha256($pw, $salt)
	{
	return '{SSHA256}'.base64_encode(hash('sha256',$pw.$salt,true).$salt);
	}

	/**
	* PostfixAdmin's hex2bin function
	* @param string $str The string to convert
	* @return string The converted string
	*/
	private function pahex2bin($str)
	{
	if(function_exists('hex2bin'))
	{
	return hex2bin($str);
	} else
	{
	$len = strlen($str);
	$nstr = "";
	for($i = 0; $i < $len; $i += 2)
	{
	$num = sscanf(substr($str, $i, 2), "%x");
	$nstr .= chr($num[0]);
	}
	return $nstr;
	}
	}

	/**
	* Convert to 64?
	*/
	private function to64($v, $n)
	{
	$ITOA64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
	$ret = "";
	while(($n - 1) >= 0)
	{
	$n--;
	$ret .= $ITOA64[$v & 0x3f];
	$v = $v>>6;
	}
	return $ret;
	}

	/**
	* Store a value in memcache or the session, if no memcache is available
	* @param string $key The key
	* @param mixed $value The value to store
	* @param int $ttl (optional) defaults to 3600 seconds.
	*/
	private function setCache($key, $value, $ttl=3600)
	{
	if ($this -> cache === NULL)
	{
	$_SESSION[$this -> session_cache_name][$key] = array(
	'value' => $value,
	'time' => time(),
	'ttl' => $ttl,
	);
	} else
	{
	$this -> cache -> set($key,$value,$ttl);
	}
	}

	/**
	* Fetch a value from memcache or session, if memcache is not available.
	* Returns NULL if there's no value stored or the value expired.
	* @param string $key
	* @return mixed\|NULL
	*/
	private function getCache($key)
	{
	$retVal = NULL;
	if ($this -> cache === NULL)
	{
	if (isset($_SESSION[$this -> session_cache_name],$_SESSION[$this -> session_cache_name][$key]))
	{
	$value = $_SESSION[$this -> session_cache_name][$key];
	if (time() < $value['time'] + $value['ttl'])
	{
	$retVal = $value['value'];
	}
	}
	} else
	{
	$retVal = $this -> cache -> get ($key);
	}
	return $retVal;
	}

	}
	?>

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