diff --git a/lam/lib/modules/posixAccount.inc b/lam/lib/modules/posixAccount.inc
index 3025c85b9..1562a2595 100644
--- a/lam/lib/modules/posixAccount.inc
+++ b/lam/lib/modules/posixAccount.inc
@@ -78,15 +78,15 @@ class posixAccount extends baseModule implements passwordService,AccountStatusPr
 	/** lamdaemon servers */
 	private $lamdaemonServers = array();
 	/** cache for group objects */
-	private $groupCache = null;
+	private $groupCache;
 	/** cache for group of names objects */
-	private $gonCache = null;
+	private $gonCache;
 	/** clear text password */
 	private $clearTextPassword;
 	/** caches the list of known UIDs */
-	private $cachedUIDList = null;
+	private $cachedUIDList;
 	/** caches the list of known user names */
-	private $cachedUserNameList = null;
+	private $cachedUserNameList;
 
 	/** replacements for common umlauts */
 	private $umlautReplacements = array(
@@ -634,8 +634,7 @@ class posixAccount extends baseModule implements passwordService,AccountStatusPr
 		for ($i = 0; $i < sizeof($gonList); $i++) {
 			$userGoNs[] = $gonList[$i]['dn'];
 		}
-		$userGoNs = array_values(array_unique($userGoNs));
-		return $userGoNs;
+		return array_values(array_unique($userGoNs));
 	}
 
 	/**
@@ -1065,11 +1064,9 @@ class posixAccount extends baseModule implements passwordService,AccountStatusPr
 				// lamdaemon results
 				if (!empty($result)) {
 					$singleresult = explode(",", $result);
-					if (is_array($singleresult)) {
-						if (($singleresult[0] == 'ERROR') || ($singleresult[0] == 'WARN') || ($singleresult[0] == 'INFO')) {
+					if (($singleresult[0] == 'ERROR') || ($singleresult[0] == 'WARN') || ($singleresult[0] == 'INFO')) {
 							$return[] = $singleresult;
 						}
-					}
 				}
 			}
 		}
@@ -1656,11 +1653,9 @@ class posixAccount extends baseModule implements passwordService,AccountStatusPr
 				// lamdaemon results
 				if (!empty($result)) {
 					$singleresult = explode(",", $result);
-					if (is_array($singleresult)) {
-						if (($singleresult[0] == 'ERROR') || ($singleresult[0] == 'WARN') || ($singleresult[0] == 'INFO')) {
+					if (($singleresult[0] == 'ERROR') || ($singleresult[0] == 'WARN') || ($singleresult[0] == 'INFO')) {
 							$return[] = $singleresult;
 						}
-					}
 				}
 			}
 			elseif (isset($_POST['form_subpage_' . get_class($this) . '_homedir_delete_' . $i])) {
@@ -1687,11 +1682,9 @@ class posixAccount extends baseModule implements passwordService,AccountStatusPr
 				// lamdaemon results
 				if (!empty($result)) {
 					$singleresult = explode(",", $result);
-					if (is_array($singleresult)) {
-						if (($singleresult[0] == 'ERROR') || ($singleresult[0] == 'WARN') || ($singleresult[0] == 'INFO')) {
+					if (($singleresult[0] == 'ERROR') || ($singleresult[0] == 'WARN') || ($singleresult[0] == 'INFO')) {
 							$return[] = $singleresult;
 						}
-					}
 				}
 			}
 		}
diff --git a/lam/lib/modules/posixGroup.inc b/lam/lib/modules/posixGroup.inc
index cc3b065b4..a5f7dc8a2 100644
--- a/lam/lib/modules/posixGroup.inc
+++ b/lam/lib/modules/posixGroup.inc
@@ -6,7 +6,7 @@ use LAM\TYPES\ConfiguredType;
 
 This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
 Copyright (C) 2003 - 2006  Tilo Lutz
-              2007 - 2022  Roland Gruber
+              2007 - 2023  Roland Gruber
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -46,11 +46,11 @@ class posixGroup extends baseModule implements passwordService {
 	/** password attribute */
 	protected $passwordAttrName = 'userPassword';
 	/** cache for existing GID numbers */
-	private $cachedGIDList = null;
+	private $cachedGIDList;
 	/** cache for existing users and their GIDs */
-	private $cachedUserToGIDList = null;
+	private $cachedUserToGIDList;
 	/** cache for existing groups */
-	private $cachedGroupNameList = null;
+	private $cachedGroupNameList;
 
 	/**
 	 * {@inheritDoc}
@@ -864,18 +864,15 @@ class posixGroup extends baseModule implements passwordService {
 							}
 						}
 					}
-					// $uids is always an array but not if no entries were found
-					if (is_array($gids)) {
-						// id-number is in use and account is a new account
-						if ((in_array($this->attributes['gidNumber'][0], $gids)) && $this->orig['gidNumber'][0]=='') {
-							$errors[] = $this->messages['gidNumber'][4];
-							unset($this->attributes['gidNumber'][0]);
-						}
-						// id-number is in use, account is existing account and id-number is not used by itself
-						if ((in_array($this->attributes['gidNumber'][0], $gids)) && $this->orig['gidNumber'][0]!='' && ($this->orig['gidNumber'][0] != $this->attributes['gidNumber'][0]) ) {
-							$errors[] = $this->messages['gidNumber'][4];
-							$this->attributes['gidNumber'][0] = $this->orig['gidNumber'][0];
-						}
+					// id-number is in use and account is a new account
+					if ((in_array($this->attributes['gidNumber'][0], $gids)) && ($this->orig['gidNumber'][0] == '')) {
+						$errors[] = $this->messages['gidNumber'][4];
+						unset($this->attributes['gidNumber'][0]);
+					}
+					// id-number is in use, account is existing account and id-number is changed
+					if ((in_array($this->attributes['gidNumber'][0], $gids)) && ($this->orig['gidNumber'][0] != '') && ($this->orig['gidNumber'][0] != $this->attributes['gidNumber'][0]) ) {
+						$errors[] = $this->messages['gidNumber'][4];
+						$this->attributes['gidNumber'][0] = $this->orig['gidNumber'][0];
 					}
 				}
 			}
@@ -1302,7 +1299,7 @@ class posixGroup extends baseModule implements passwordService {
 	 * @param ConfiguredType $type account type
 	 * @return array list of GID numbers
 	 */
-	private function getGIDs($type) {
+	private function getGIDs(ConfiguredType $type): array {
 		if ($this->cachedGIDList != null) {
 			return $this->cachedGIDList;
 		}
diff --git a/lam/lib/modules/puppetClient.inc b/lam/lib/modules/puppetClient.inc
index a0ef37b84..ae34d69ea 100644
--- a/lam/lib/modules/puppetClient.inc
+++ b/lam/lib/modules/puppetClient.inc
@@ -7,7 +7,7 @@ use LAM\TYPES\ConfiguredType;
 /*
 
   This code is not yet part of LDAP Account Manager (http://www.ldap-account-manager.org/)
-  Copyright (C) 2012 - 2022  Roland Gruber
+  Copyright (C) 2012 - 2023  Roland Gruber
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -41,9 +41,9 @@ use LAM\TYPES\ConfiguredType;
 class puppetClient extends baseModule {
 
 	/** cache for classes */
-	private $classCache = null;
+	private $classCache;
 	/** cache for variables */
-	private $variablesCache = null;
+	private $variablesCache;
 
 	/**
 	* Creates a new authorizedServiceObject object.
@@ -430,9 +430,7 @@ class puppetClient extends baseModule {
 		$possibleParentNodes = $this->getPossibleParentNodes();
 		array_unshift($possibleParentNodes, '-');
 		$possibleParentNodes = array_values($possibleParentNodes);
-		if (sizeof($possibleParentNodes) > 0) {
-			$return->add(new htmlResponsiveSelect('puppetClient_parentnode', $possibleParentNodes, array(), _('Parent node'), 'parentnode'), 12);
-		}
+		$return->add(new htmlResponsiveSelect('puppetClient_parentnode', $possibleParentNodes, array(), _('Parent node'), 'parentnode'));
 		return $return;
 	}
 
@@ -470,7 +468,6 @@ class puppetClient extends baseModule {
 	 * @return array parent nodes (e.g. array('node1', 'node2'))
 	 */
 	private function getPossibleParentNodes() {
-		$possibleParentNodes = array();
 		$searchResult = searchLDAPByAttribute('cn', '*', 'puppetClient', array('cn'), array('host'));
 		$possibleParentNodes = array();
 		for ($i = 0; $i < sizeof($searchResult); $i++) {
diff --git a/lam/lib/modules/pykotaBillingCode.inc b/lam/lib/modules/pykotaBillingCode.inc
index 271640233..dc951417e 100644
--- a/lam/lib/modules/pykotaBillingCode.inc
+++ b/lam/lib/modules/pykotaBillingCode.inc
@@ -2,7 +2,7 @@
 /*
 
   This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
-  Copyright (C) 2013 - 2022  Roland Gruber
+  Copyright (C) 2013 - 2023  Roland Gruber
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -41,7 +41,7 @@ class pykotaBillingCode extends baseModule {
 	const ATTRIBUTES_TO_IGNORE_ON_COPY = array('pykotaBalance', 'pykotaPageCounter', 'pykotaBillingCode');
 
 	/** cache for existing codes (array(dn1 => pykotaBillingCode1, dn2 => pykotaBillingCode2)) */
-	private $codeCache = null;
+	private $codeCache;
 
 	/**
 	* Returns true if this module can manage accounts of the current type, otherwise false.
diff --git a/lam/lib/modules/pykotaGroup.inc b/lam/lib/modules/pykotaGroup.inc
index aca48ef63..400033b52 100644
--- a/lam/lib/modules/pykotaGroup.inc
+++ b/lam/lib/modules/pykotaGroup.inc
@@ -5,7 +5,7 @@ use \LAM\TYPES\TypeManager;
 /*
 
   This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
-  Copyright (C) 2013 - 2022  Roland Gruber
+  Copyright (C) 2013 - 2023  Roland Gruber
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -42,9 +42,9 @@ class pykotaGroup extends baseModule {
 	const ATTRIBUTES_TO_IGNORE_ON_COPY = array('pykotaGroupName');
 
 	/** cache for cn attribute */
-	private $cnCache = null;
+	private $cnCache;
 	/** cache for pykotaGroupName attribute */
-	private $pykotaGroupNameCache = null;
+	private $pykotaGroupNameCache;
 	/** list of limit options label => value */
 	private $limitOptions;
 
diff --git a/lam/lib/modules/pykotaPrinter.inc b/lam/lib/modules/pykotaPrinter.inc
index 2a373e00f..85f29d36b 100644
--- a/lam/lib/modules/pykotaPrinter.inc
+++ b/lam/lib/modules/pykotaPrinter.inc
@@ -2,7 +2,7 @@
 /*
 
   This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
-  Copyright (C) 2013 - 2022  Roland Gruber
+  Copyright (C) 2013 - 2023  Roland Gruber
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -41,9 +41,9 @@ class pykotaPrinter extends baseModule {
 	const ATTRIBUTES_TO_IGNORE_ON_COPY = array('pykotaPrinterName');
 
 	/** cache for existing printers (array(dn => array(cn => ..., description => ...))) */
-	private $printerCache = null;
+	private $printerCache;
 	/** printer group cache */
-	private $groupCache = null;
+	private $groupCache;
 	/** list of pass through options: label => value */
 	private $passThroughOptions;
 
diff --git a/lam/lib/modules/pykotaUser.inc b/lam/lib/modules/pykotaUser.inc
index a67864eca..0a01c47df 100644
--- a/lam/lib/modules/pykotaUser.inc
+++ b/lam/lib/modules/pykotaUser.inc
@@ -7,7 +7,7 @@ use \LAM\TYPES\TypeManager;
 /*
 
   This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
-  Copyright (C) 2013 - 2022  Roland Gruber
+  Copyright (C) 2013 - 2023  Roland Gruber
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -45,9 +45,9 @@ class pykotaUser extends baseModule {
 		'pykotaPayments');
 
 	/** cache for uid attribute */
-	private $uidCache = null;
+	private $uidCache;
 	/** cache for pykotaUserName attribute */
-	private $pykotaUserNameCache = null;
+	private $pykotaUserNameCache;
 	/** list of limit options label => value */
 	private $limitOptions;
 
diff --git a/lam/lib/modules/sambaGroupMapping.inc b/lam/lib/modules/sambaGroupMapping.inc
index 826a36115..034f8c4cd 100644
--- a/lam/lib/modules/sambaGroupMapping.inc
+++ b/lam/lib/modules/sambaGroupMapping.inc
@@ -6,7 +6,7 @@ use \LAM\TYPES\TypeManager;
 
   This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
   Copyright (C) 2003 - 2006  Tilo Lutz
-                2007 - 2022  Roland Gruber
+                2007 - 2023  Roland Gruber
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -52,9 +52,9 @@ class sambaGroupMapping extends baseModule {
 	/** Array of sambaGroupTypes */
 	private $sambaGroupTypes;
 	/** cache for domain list */
-	private $cachedDomainList = null;
+	private $cachedDomainList;
 	/** cache for existing Samba entries (array(dn => cn)) */
-	private $sidCache = null;
+	private $sidCache;
 
 	/**
 	* Creates a new module for Samba 3 groups.
diff --git a/lam/lib/modules/sambaSamAccount.inc b/lam/lib/modules/sambaSamAccount.inc
index 93290212f..d09368fb1 100644
--- a/lam/lib/modules/sambaSamAccount.inc
+++ b/lam/lib/modules/sambaSamAccount.inc
@@ -79,11 +79,11 @@ class sambaSamAccount extends baseModule implements passwordService,AccountStatu
 	/** specifies if the password should be expired */
 	private $expirePassword = false;
 	/** host cache to reduce LDAP queries */
-	private $cachedHostList = null;
+	private $cachedHostList;
 	/** group cache to reduce LDAP queries */
-	private $cachedGroupSIDList = null;
+	private $cachedGroupSIDList;
 	/** cache for domain list */
-	private $cachedDomainList = null;
+	private $cachedDomainList;
 	/** delimiter for remote commands */
 	private static $SPLIT_DELIMITER = "###x##y##x###";
 
diff --git a/lam/lib/modules/windowsUser.inc b/lam/lib/modules/windowsUser.inc
index 09eed6e27..021d923e7 100644
--- a/lam/lib/modules/windowsUser.inc
+++ b/lam/lib/modules/windowsUser.inc
@@ -77,32 +77,32 @@ class windowsUser extends baseModule implements passwordService,AccountStatusPro
 	/** original group list */
 	private $groupList_orig = array();
 	/** cache for groups */
-	private $groupCache = null;
+	private $groupCache;
 	/** host cache to reduce LDAP queries */
-	private $cachedHostList = null;
+	private $cachedHostList;
 	/** option for forcing password change, used in postModifyActions */
-	private $pwdLastSet = null;
+	private $pwdLastSet;
 	/** clear text password */
 	private $clearTextPassword;
 	/** cache for departments */
-	private $departmentCache = null;
+	private $departmentCache;
 	/** cache for department numbers */
-	private $departmentNumberCache = null;
+	private $departmentNumberCache;
 	/** organization cache */
-	private $oCache = null;
+	private $oCache;
 	/** organizational unit cache */
-	private $ouCache = null;
+	private $ouCache;
 	/** title cache */
-	private $titleCache = null;
+	private $titleCache;
 	/** employee type cache */
-	private $employeeTypeCache = null;
+	private $employeeTypeCache;
 	/** business category cache */
-	private $businessCategoryCache = null;
+	private $businessCategoryCache;
 
 	/** cache for user name */
-	private $cachedUserNameList = null;
+	private $cachedUserNameList;
 	/** cache for cn */
-	private $cachedCnList = null;
+	private $cachedCnList;
 
 
 	/**
@@ -1638,11 +1638,9 @@ class windowsUser extends baseModule implements passwordService,AccountStatusPro
 		switch ($mode) {
 			case self::DISPLAY_GROUPS_CN:
 				return $cn;
-				break;
 			case self::DISPLAY_GROUPS_DN:
 			default:
 				return getAbstractDN($dn);
-				break;
 		}
 	}
 
@@ -4945,7 +4943,7 @@ if (interface_exists('\LAM\JOB\Job', false)) {
 			$now = new DateTime('now', getTimeZone());
 			$baseDate = $this->getBaseDate($now);
 			$monthInterval = $this->getMonthInterval($options, $jobID);
-			if (!$this->shouldRun($pdo, $options, $jobID, $baseDate, $monthInterval)) {
+			if (!$this->shouldRun($pdo, $jobID, $baseDate, $monthInterval)) {
 				$this->jobResultLog->logDebug('No run needed yet');
 				return;
 			}
@@ -4975,13 +4973,12 @@ if (interface_exists('\LAM\JOB\Job', false)) {
 		 * Returns if the job should run.
 		 *
 		 * @param $pdo PDO
-		 * @param $options job options
 		 * @param $jobId job id
 		 * @param DateTime $baseDate base date
 		 * @param int $monthInterval month interval
 		 * @return bool should run
 		 */
-		private function shouldRun(&$pdo, $options, $jobId, $baseDate, $monthInterval) {
+		private function shouldRun(&$pdo, $jobId, $baseDate, $monthInterval) {
 			$dbLastChange = $this->getDBLastPwdChangeTime($jobId, $pdo, $jobId);
 			if (empty($dbLastChange)) {
 				return true;