diff --git a/lam/templates/config/confImportExport.php b/lam/templates/config/confImportExport.php
index ac51aed91..ec48d4d57 100644
--- a/lam/templates/config/confImportExport.php
+++ b/lam/templates/config/confImportExport.php
@@ -73,6 +73,9 @@ if (isset($_POST['exportConfig']) && $cfg->checkPassword($_SESSION["mainconf_pas
 	try {
 		$zip = new ZipArchive();
 		$zipTmpFile = tmpfile();
+		if ($zipTmpFile === false) {
+		    throw new LAMException(_('Unable to create temporary file.'));
+        }
 		$zipFile = stream_get_meta_data($zipTmpFile)['uri'];
 		fclose($zipTmpFile);
 		$zip->open($zipFile, ZipArchive::CREATE);
@@ -80,7 +83,14 @@ if (isset($_POST['exportConfig']) && $cfg->checkPassword($_SESSION["mainconf_pas
 		$zip->addFromString('lam-config.json', $json);
 		$zip->close();
         $handle = fopen($zipFile, "r");
-        $contents = fread($handle, filesize($zipFile));
+        if ($handle === false) {
+			throw new LAMException(_('Unable to create temporary file.'));
+        }
+        $fileSize = filesize($zipFile);
+		if ($fileSize === false) {
+			throw new LAMException(_('Unable to create temporary file.'));
+		}
+        $contents = fread($handle, $fileSize);
         fclose($handle);
 		unlink($zipFile);
         echo $contents;
@@ -244,7 +254,13 @@ printHeaderContents(_("Import and export configuration"), '../..');
                 }
 	            else {
 		            $handle = fopen($tmpFileName, "r");
+		            if ($handle === false) {
+						throw new LAMException(_('Unable to read import file.'));
+                    }
 		            $data = fread($handle, 100000000);
+					if ($data === false) {
+						throw new LAMException(_('Unable to read import file.'));
+					}
 		            fclose($handle);
                 }
 	            $importer = new ConfigDataImporter();
@@ -260,7 +276,7 @@ printHeaderContents(_("Import and export configuration"), '../..');
 	            $validUpload = true;
             }
             catch (LAMException $e) {
-                $content->add(new htmlStatusMessage('ERROR', htmlspecialchars($e->getTitle()), htmlspecialchars($e->getMessage())), 12);
+                $content->add(new htmlStatusMessage('ERROR', htmlspecialchars($e->getTitle()), htmlspecialchars($e->getMessage())));
             }
         }
         if (!isset($_POST['importConfigConfirm']) && !$validUpload) {
@@ -277,14 +293,14 @@ printHeaderContents(_("Import and export configuration"), '../..');
                 $stepCheckbox->setLabelAfterCheckbox();
                 $stepCheckbox->setCSSClasses(array('bold'));
                 $subStepIds = array();
-                $content->add($stepCheckbox, 12);
+                $content->add($stepCheckbox);
 	            $content->addVerticalSpacer('0.3rem');
                 foreach ($importStep->getSubSteps() as $subStep) {
                     $subStepKey = 'step_' . $subStep->getKey();
                     $subStepIds[] = $subStepKey;
 	                $subStepCheckbox = new htmlResponsiveInputCheckbox($subStepKey, true, $subStep->getLabel());
 	                $subStepCheckbox->setLabelAfterCheckbox();
-	                $content->add($subStepCheckbox, 12);
+	                $content->add($subStepCheckbox);
                 }
                 $stepCheckbox->setTableRowsToShow($subStepIds);
                 $content->addVerticalSpacer('1rem');
@@ -294,13 +310,19 @@ printHeaderContents(_("Import and export configuration"), '../..');
             $importButton->setCSSClasses(array('lam-secondary'));
 	        $buttonGroup->addElement($importButton);
 	        $buttonGroup->addElement(new htmlButton('importCancel', _('Cancel')));
-	        $content->add($buttonGroup, 12);
+	        $content->add($buttonGroup);
         }
         elseif (isset($_POST['importConfigConfirm'])) {
-			$handle = fopen($_SESSION['configImportFile'], "r");
-	        $data = fread($handle, 100000000);
-	        fclose($handle);
 	        try {
+				$handle = fopen($_SESSION['configImportFile'], "r");
+				if ($handle === false) {
+					throw new LAMException(_('Unable to read import file.'));
+				}
+				$data = fread($handle, 100000000);
+				if ($data === false) {
+					throw new LAMException(_('Unable to read import file.'));
+				}
+				fclose($handle);
 		        $importer = new ConfigDataImporter();
 		        $importSteps = $importer->getPossibleImportSteps($data);
 		        foreach ($importSteps as $importStep) {
@@ -311,12 +333,12 @@ printHeaderContents(_("Import and export configuration"), '../..');
 		        }
 		        $importer->runImport($importSteps);
 		        unlink($_SESSION['configImportFile']);
-		        $content->add(new htmlStatusMessage('INFO', _('Configuration import ended successful.')), 12);
-		        $content->add(new htmlButton('importNew', _('New import')), 12);
+		        $content->add(new htmlStatusMessage('INFO', _('Configuration import ended successful.')));
+		        $content->add(new htmlButton('importNew', _('New import')));
 	        }
 	        catch (LAMException $e) {
-		        $content->add(new htmlStatusMessage('ERROR', htmlspecialchars($e->getTitle()), htmlspecialchars($e->getMessage())), 12);
-		        $content->add(new htmlButton('importCancel', _('Back')), 12);
+		        $content->add(new htmlStatusMessage('ERROR', htmlspecialchars($e->getTitle()), htmlspecialchars($e->getMessage())));
+		        $content->add(new htmlButton('importCancel', _('Back')));
 	        }
         }
     }
diff --git a/lam/templates/config/confmain.php b/lam/templates/config/confmain.php
index 0eb8a6c34..976b06cce 100644
--- a/lam/templates/config/confmain.php
+++ b/lam/templates/config/confmain.php
@@ -411,6 +411,9 @@ foreach ($tools as $tool) {
     }
 	$hideableTools++;
 	$toolClass = get_class($tool);
+	if ($toolClass === false) {
+	    continue;
+    }
 	$toolName = substr($toolClass, strrpos($toolClass, '\\') + 1);
 	$selected = false;
 	if (isset($toolSettings['tool_hide_' . $toolName]) && ($toolSettings['tool_hide_' . $toolName] === 'true')) {
@@ -769,6 +772,9 @@ function checkInput(): array {
     }
 	foreach ($tools as $tool) {
 	    $toolClass = get_class($tool);
+	    if ($toolClass === false) {
+	        continue;
+        }
 	    $toolName = substr($toolClass, strrpos($toolClass, '\\') + 1);
 		$toolConfigID = 'tool_hide_' . $toolName;
 		if ((isset($_POST[$toolConfigID])) && ($_POST[$toolConfigID] == 'on')) {
diff --git a/lam/templates/config/mainlogin.php b/lam/templates/config/mainlogin.php
index ad57e3508..0bde64853 100644
--- a/lam/templates/config/mainlogin.php
+++ b/lam/templates/config/mainlogin.php
@@ -73,17 +73,7 @@ printHeaderContents(_("Login"), '../..');
 	<body>
 		<?php
 			// include all JavaScript files
-			$jsDirName = dirname(__FILE__) . '/../lib';
-			$jsDir = dir($jsDirName);
-			$jsFiles = array();
-			while ($jsEntry = $jsDir->read()) {
-				if (substr($jsEntry, strlen($jsEntry) - 3, 3) != '.js') continue;
-				$jsFiles[] = $jsEntry;
-			}
-			sort($jsFiles);
-			foreach ($jsFiles as $jsEntry) {
-				echo "<script type=\"text/javascript\" src=\"../lib/" . $jsEntry . "\"></script>\n";
-			}
+		    printJsIncludes('../..');
 		?>
         <div id="lam-topnav" class="lam-header">
             <div class="lam-header-left lam-menu-stay">
diff --git a/lam/templates/config/mainmanage.php b/lam/templates/config/mainmanage.php
index 3a8a5b7de..da26739b1 100644
--- a/lam/templates/config/mainmanage.php
+++ b/lam/templates/config/mainmanage.php
@@ -142,12 +142,14 @@ if (isset($_POST['submitFormData'])) {
         }
 		if (($cfg->licenseWarningType === LAMCfgMain::LICENSE_WARNING_EMAIL) || ($cfg->licenseWarningType === LAMCfgMain::LICENSE_WARNING_ALL)) {
 		    $toEmails = preg_split('/;[ ]*/', $cfg->licenseEmailTo);
-		    foreach ($toEmails as $toEmail) {
-		        if (!get_preg($toEmail, 'email')) {
-			        $errors[] = _('Licence') . ': ' . _('TO address') . ' - ' . _('Please enter a valid email address!');
-			        break;
-                }
-		    }
+		    if ($toEmails !== false) {
+				foreach ($toEmails as $toEmail) {
+					if (!get_preg($toEmail, 'email')) {
+						$errors[] = _('Licence') . ': ' . _('TO address') . ' - ' . _('Please enter a valid email address!');
+						break;
+					}
+				}
+            }
 		}
 	}
 	// set session timeout
@@ -237,16 +239,28 @@ if (isset($_POST['submitFormData'])) {
 	if (isset($_POST['sslCaCertUpload'])) {
 		if (!isset($_FILES['sslCaCert']) || ($_FILES['sslCaCert']['size'] == 0)) {
 			$errors[] = _('No file selected.');
-		} else {
+		}
+		else {
 			$handle = fopen($_FILES['sslCaCert']['tmp_name'], "r");
-			$data = fread($handle, 10000000);
-			fclose($handle);
-			$sslReturn = $cfg->uploadSSLCaCert($data);
-			if ($sslReturn !== true) {
-				$errors[] = $sslReturn;
-			} else {
-				$messages[] = _('You might need to restart your webserver for changes to take effect.');
+			if ($handle === false) {
+				$errors[] = _('Unable to create temporary file.');
 			}
+			else {
+				$data = fread($handle, 10000000);
+				if ($data === false) {
+					$errors[] = _('Unable to create temporary file.');
+				}
+				else {
+					fclose($handle);
+					$sslReturn = $cfg->uploadSSLCaCert($data);
+					if ($sslReturn !== true) {
+						$errors[] = $sslReturn;
+					}
+					else {
+						$messages[] = _('You might need to restart your webserver for changes to take effect.');
+					}
+                }
+            }
 		}
 	}
 	if (isset($_POST['sslCaCertDelete'])) {
@@ -482,7 +496,9 @@ printHeaderContents(_("Edit general settings"), '../..');
 			$validTo = isset($sslCerts[$i]['validTo_time_t']) ? $sslCerts[$i]['validTo_time_t'] : '';
 			if (get_preg($validTo, 'digit')) {
 			    $date = DateTime::createFromFormat('U', $validTo, new DateTimeZone('UTC'));
-			    $validTo = $date->format('Y-m-d');
+			    if ($date !== false) {
+					$validTo = $date->format('Y-m-d');
+                }
             }
 			$cn = isset($sslCerts[$i]['subject']['CN']) ? $sslCerts[$i]['subject']['CN'] : '';
 			$delBtn = new htmlButton('deleteCert_' . $i, 'del.svg', true);
diff --git a/lam/templates/initsuff.php b/lam/templates/initsuff.php
index 4feda7b20..faf1350e3 100644
--- a/lam/templates/initsuff.php
+++ b/lam/templates/initsuff.php
@@ -2,7 +2,7 @@
 /*
 
   This code is part of LDAP Account Manager (http://www.ldap-account-manager.org/)
-  Copyright (C) 2003 - 2021  Roland Gruber
+  Copyright (C) 2003 - 2022  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
diff --git a/lam/tmp/.gitignore b/lam/tmp/.gitignore
index 1de9150f5..79f723c85 100644
--- a/lam/tmp/.gitignore
+++ b/lam/tmp/.gitignore
@@ -1,4 +1,5 @@
 /*.jpg
 /*.pem
 /*.log
-/*.pdf
\ No newline at end of file
+/*.pdf
+/*.tmp
diff --git a/lam/tmp/internal/.gitignore b/lam/tmp/internal/.gitignore
new file mode 100644
index 000000000..79f723c85
--- /dev/null
+++ b/lam/tmp/internal/.gitignore
@@ -0,0 +1,5 @@
+/*.jpg
+/*.pem
+/*.log
+/*.pdf
+/*.tmp
diff --git a/phpstan.neon b/phpstan.neon
index 855b82a80..6de3dbc88 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -22,3 +22,9 @@ parameters:
 		- '#PHPDoc tag @throws with type LAMException is not subtype of Throwable#'
 		- '#Throwing object of an unknown class [a-zA-Z0-9\\_-]+.#'
 		- '#Parameter \#[0-9] \$[a-zA-Z_]+ of function [a-zA-Z_]+ expects [(]?callable.*#'
+		- '#Call to an undefined method object::.*#'
+		- '#Parameter \#2 \$string of function explode expects string, array\|string given.#'
+		- '#Parameter \#2 \$result of function ldap_get_entries expects LDAP\\Result, array\|LDAP\\Result given.#'
+		- '#Cannot assign new offset to array<int, string>\|string.#'
+		- '#Parameter \#1 \$result of function ldap_free_result expects LDAP\\Result, array\|LDAP\\Result given.#'
+		- '#Cannot access offset .* on array\|int.#'