diff --git a/src/ACL/Login.php b/src/ACL/Login.php
index 2a38c21..2ed56c0 100644
--- a/src/ACL/Login.php
+++ b/src/ACL/Login.php
@@ -960,10 +960,7 @@ class Login
 					. "AND ear.edit_access_right_id = epa.edit_access_right_id "
 					. "AND epa.enabled = 1 AND epa.edit_group_id = " . $res["edit_group_id"] . " "
 					. "ORDER BY ep.order_number";
-				while ($res = $this->db->dbReturn($q)) {
-					if (!is_array($res)) {
-						break;
-					}
+				while (is_array($res = $this->db->dbReturn($q))) {
 					// page id array for sub data readout
 					$edit_page_ids[$res['edit_page_id']] = $res['cuid'];
 					// create the array for pages
@@ -1303,11 +1300,9 @@ class Login
 	{
 		$is_valid_password = true;
 		// check for valid in regex arrays in list
-		if (is_array($this->password_valid_chars)) {
-			foreach ($this->password_valid_chars as $password_valid_chars) {
-				if (!preg_match("/$password_valid_chars/", $password)) {
-					$is_valid_password = false;
-				}
+		foreach ($this->password_valid_chars as $password_valid_chars) {
+			if (!preg_match("/$password_valid_chars/", $password)) {
+				$is_valid_password = false;
 			}
 		}
 		// check for min length
diff --git a/src/Admin/Backend.php b/src/Admin/Backend.php
index 9f705c7..5fb2918 100644
--- a/src/Admin/Backend.php
+++ b/src/Admin/Backend.php
@@ -425,10 +425,7 @@ class Backend
 		?string $set_content_path = null,
 		int $flag = 0,
 	): array {
-		if (
-			$set_content_path === null ||
-			!is_string($set_content_path)
-		) {
+		if ($set_content_path === null) {
 			/** @deprecated adbTopMenu missing set_content_path parameter */
 			trigger_error(
 				'Calling adbTopMenu without set_content_path parameter is deprecated',
diff --git a/src/Check/Colors.php b/src/Check/Colors.php
index d896664..8630dd1 100644
--- a/src/Check/Colors.php
+++ b/src/Check/Colors.php
@@ -119,6 +119,13 @@ class Colors
 
 	/**
 	 * check if html/css color string is valid
+	 *
+	 * TODO: update check for correct validate values
+	 * - space instead of ","
+	 * - / opcatiy checks
+	 * - loose numeric values
+	 * - lab/lch,oklab/oklch validation too
+	 *
 	 * @param string $color A color string of any format
 	 * @param int $flags    defaults to ALL, else use | to combined from
 	 *                      HEX_RGB, HEX_RGBA, RGB, RGBA, HSL, HSLA
@@ -168,9 +175,9 @@ class Colors
 		if (preg_match("/$regex/", $color)) {
 			// if valid regex, we now need to check if the content is actually valid
 			// only for rgb/hsl type
-			/** @var int|false */
+			/** @var int<0, max>|false */
 			$rgb_flag = strpos($color, 'rgb');
-			/** @var int|false */
+			/** @var int<0, max>|false */
 			$hsl_flag = strpos($color, 'hsl');
 			// if both not match, return true
 			if (
diff --git a/src/Convert/Color/CieXyz.php b/src/Convert/Color/CieXyz.php
index 2784f3e..40c90bb 100644
--- a/src/Convert/Color/CieXyz.php
+++ b/src/Convert/Color/CieXyz.php
@@ -246,7 +246,7 @@ class CieXyz
 			self::convertArray(array_map(
 				fn ($k, $v) => $v * $d50[$k],
 				array_keys($xyz),
-				array_values($xyz),
+				$xyz,
 			)),
 			options: ["whitepoint" => 'D50']
 		);
diff --git a/src/Convert/Math.php b/src/Convert/Math.php
index 41eb746..daf4bf0 100644
--- a/src/Convert/Math.php
+++ b/src/Convert/Math.php
@@ -158,6 +158,8 @@ class Math
 	 *   [0, 0, 0] <- automatically added
 	 * ]
 	 *
+	 * The same is done for unbalanced entries, they are filled with 0
+	 *
 	 * @param  array<float|int|array<int|float>> $a m x n matrice
 	 * @param  array<float|int|array<int|float>> $b n x p matrice
 	 *
@@ -186,7 +188,7 @@ class Math
 		// so that we can multiply row by row
 		$bCols = array_map(
 			callback: fn ($k) => array_map(
-				(fn ($i) => is_array($i) ? $i[$k] : 0),
+				(fn ($i) => is_array($i) ? $i[$k] ?? 0 : 0),
 				$b,
 			),
 			array: array_keys($b[0]),
diff --git a/src/Create/Uids.php b/src/Create/Uids.php
index 4769133..4233979 100644
--- a/src/Create/Uids.php
+++ b/src/Create/Uids.php
@@ -38,7 +38,7 @@ class Uids
 			$uniqid_length++;
 		}
 		/** @var int<1,max> make sure that internal this is correct */
-		$random_bytes_length = ($uniqid_length - ($uniqid_length % 2)) / 2;
+		$random_bytes_length = (int)(($uniqid_length - ($uniqid_length % 2)) / 2);
 		$uniqid = bin2hex(random_bytes($random_bytes_length));
 		// if not forced shorten return next lower length
 		if (!$force_length) {
diff --git a/src/DB/Extended/ArrayIO.php b/src/DB/Extended/ArrayIO.php
index d40b71b..ac98091 100644
--- a/src/DB/Extended/ArrayIO.php
+++ b/src/DB/Extended/ArrayIO.php
@@ -374,7 +374,7 @@ class ArrayIO extends \CoreLibs\DB\IO
 	public function dbDelete(array $table_array = [], bool $acl_limit = false): array
 	{
 		// is array and has values, override set and set new
-		if (is_array($table_array) && count($table_array)) {
+		if (count($table_array)) {
 			$this->table_array = $table_array;
 		}
 		if (!$this->dbCheckPkSet()) {
@@ -440,7 +440,7 @@ class ArrayIO extends \CoreLibs\DB\IO
 	public function dbRead(bool $edit = false, array $table_array = []): array
 	{
 		// if array give, overrules internal array
-		if (is_array($table_array) && count($table_array)) {
+		if (count($table_array)) {
 			$this->table_array = $table_array;
 		}
 		if (!$this->dbCheckPkSet()) {
diff --git a/src/DB/IO.php b/src/DB/IO.php
index d3ecc37..cae7cf5 100644
--- a/src/DB/IO.php
+++ b/src/DB/IO.php
@@ -914,7 +914,7 @@ class IO
 		if ($cursor !== false) {
 			[$db_prefix, $db_error_string] = $this->db_functions->__dbPrintError($cursor);
 		}
-		if ($cursor === false && method_exists($this->db_functions, '__dbPrintError')) {
+		if ($cursor === false && method_exists($this->db_functions, '__dbPrintError')) { /** @phpstan-ignore-line */
 			[$db_prefix, $db_error_string] = $this->db_functions->__dbPrintError();
 		}
 		// prefix the master if not the same
@@ -1737,7 +1737,7 @@ class IO
 	{
 		if (
 			!empty($this->dbh) &&
-			$this->dbh instanceof \PgSql\Connection
+			$this->dbh instanceof \PgSql\Connection /** @phpstan-ignore-line future could be other */
 		) {
 			// reset any client encodings set
 			$this->dbResetEncoding();
diff --git a/src/Language/Core/GetTextReader.php b/src/Language/Core/GetTextReader.php
index 0a5715a..dd1ef96 100644
--- a/src/Language/Core/GetTextReader.php
+++ b/src/Language/Core/GetTextReader.php
@@ -190,7 +190,6 @@ class GetTextReader
 	private function loadTables(): void
 	{
 		if (
-			is_array($this->cache_translations) &&
 			is_array($this->table_originals) &&
 			is_array($this->table_translations)
 		) {
@@ -318,10 +317,7 @@ class GetTextReader
 
 		if ($this->enable_cache) {
 			// Caching enabled, get translated string from cache
-			if (
-				is_array($this->cache_translations) &&
-				array_key_exists($string, $this->cache_translations)
-			) {
+			if (array_key_exists($string, $this->cache_translations)) {
 				return $this->cache_translations[$string];
 			} else {
 				return $string;
@@ -481,7 +477,7 @@ class GetTextReader
 		$key = $single . chr(0) . $plural;
 
 		if ($this->enable_cache) {
-			if (is_array($this->cache_translations) && !array_key_exists($key, $this->cache_translations)) {
+			if (!array_key_exists($key, $this->cache_translations)) {
 				return ($number != 1) ? $plural : $single;
 			} else {
 				$result = $this->cache_translations[$key];
diff --git a/src/Output/Form/Generate.php b/src/Output/Form/Generate.php
index 62ca737..68e7a1d 100644
--- a/src/Output/Form/Generate.php
+++ b/src/Output/Form/Generate.php
@@ -474,7 +474,7 @@ class Generate
 					$page_name_camel_case
 			);
 		try {
-			/** @var TableArrays\Interface\TableArraysInterface|false $class */
+			/** @var TableArrays\Interface\TableArraysInterface $class */
 			$class = new $class_string($this);
 		} catch (\Throwable $t) {
 			$this->log->critical('CLASS LOADING: Failed loading: ' . $class_string . ' => ' . $t->getMessage());
@@ -1757,14 +1757,9 @@ class Generate
 				$this->dba->setTableArrayEntry($this->dba->getTableArray()[$key]['preset'], $key, 'value');
 			}
 		}
-		if (is_array($this->reference_array)) {
-			if (!is_array($this->reference_array)) {
-				$this->reference_array = [];
-			}
-			reset($this->reference_array);
-			foreach ($this->reference_array as $key => $value) {
-				unset($this->reference_array[$key]['selected']);
-			}
+		reset($this->reference_array);
+		foreach ($this->reference_array as $key => $value) {
+			unset($this->reference_array[$key]['selected']);
 		}
 		$this->warning = 1;
 		$this->msg = $this->l->__('Cleared for new Dataset!');
@@ -1787,20 +1782,15 @@ class Generate
 			$this->dba->unsetTableArrayEntry($key, 'input_value');
 		}
 
-		if (is_array($this->reference_array)) {
-			// load each reference_table
-			if (!is_array($this->reference_array)) {
-				$this->reference_array = [];
-			}
-			reset($this->reference_array);
-			foreach ($this->reference_array as $key => $value) {
-				unset($this->reference_array[$key]['selected']);
-				$q = 'SELECT ' . $this->reference_array[$key]['other_table_pk']
-					. ' FROM ' . $this->reference_array[$key]['table_name']
-					. ' WHERE ' . $this->int_pk_name . ' = ' . $this->dba->getTableArray()[$this->int_pk_name]['value'];
-				while (is_array($res = $this->dba->dbReturn($q))) {
-					$this->reference_array[$key]['selected'][] = $res[$this->reference_array[$key]['other_table_pk']];
-				}
+		// load each reference_table
+		reset($this->reference_array);
+		foreach ($this->reference_array as $key => $value) {
+			unset($this->reference_array[$key]['selected']);
+			$q = 'SELECT ' . $this->reference_array[$key]['other_table_pk']
+				. ' FROM ' . $this->reference_array[$key]['table_name']
+				. ' WHERE ' . $this->int_pk_name . ' = ' . $this->dba->getTableArray()[$this->int_pk_name]['value'];
+			while (is_array($res = $this->dba->dbReturn($q))) {
+				$this->reference_array[$key]['selected'][] = $res[$this->reference_array[$key]['other_table_pk']];
 			}
 		}
 		$this->warning = 1;
@@ -1979,24 +1969,19 @@ class Generate
 		// write the object
 		$this->dba->dbWrite($addslashes, [], true);
 		// write reference array (s) if necessary
-		if (is_array($this->reference_array)) {
-			if (!is_array($this->reference_array)) {
-				$this->reference_array = [];
+		reset($this->reference_array);
+		foreach ($this->reference_array as $reference_array) {
+			$q = 'DELETE FROM ' . $reference_array['table_name']
+				. ' WHERE ' . $this->int_pk_name . ' = ' . $this->dba->getTableArray()[$this->int_pk_name]['value'];
+			$this->dba->dbExec($q);
+			$q = 'INSERT INTO ' . $reference_array['table_name']
+				. ' (' . $reference_array['other_table_pk'] . ', ' . $this->int_pk_name . ') VALUES ';
+			for ($i = 0, $i_max = count($reference_array['selected']); $i < $i_max; $i++) {
+				$t_q = '(' . $reference_array['selected'][$i] . ', '
+					. $this->dba->getTableArray()[$this->int_pk_name]['value'] . ')';
+				$this->dba->dbExec($q . $t_q);
 			}
-			reset($this->reference_array);
-			foreach ($this->reference_array as $reference_array) {
-				$q = 'DELETE FROM ' . $reference_array['table_name']
-					. ' WHERE ' . $this->int_pk_name . ' = ' . $this->dba->getTableArray()[$this->int_pk_name]['value'];
-				$this->dba->dbExec($q);
-				$q = 'INSERT INTO ' . $reference_array['table_name']
-					. ' (' . $reference_array['other_table_pk'] . ', ' . $this->int_pk_name . ') VALUES ';
-				for ($i = 0, $i_max = count($reference_array['selected']); $i < $i_max; $i++) {
-					$t_q = '(' . $reference_array['selected'][$i] . ', '
-						. $this->dba->getTableArray()[$this->int_pk_name]['value'] . ')';
-					$this->dba->dbExec($q . $t_q);
-				}
-			} // foreach reference arrays
-		} // if reference arrays
+		} // foreach reference arrays
 		// write element list
 		if (!empty($this->element_list)) {
 			$type = [];
@@ -2230,16 +2215,11 @@ class Generate
 	public function formDeleteTableArray()
 	{
 		// remove any reference arrays
-		if (is_array($this->reference_array)) {
-			if (!is_array($this->reference_array)) {
-				$this->reference_array = [];
-			}
-			reset($this->reference_array);
-			foreach ($this->reference_array as $reference_array) {
-				$q = 'DELETE FROM ' . $reference_array['table_name']
-					. ' WHERE ' . $this->int_pk_name . ' = ' . $this->dba->getTableArray()[$this->int_pk_name]['value'];
-				$this->dba->dbExec($q);
-			}
+		reset($this->reference_array);
+		foreach ($this->reference_array as $reference_array) {
+			$q = 'DELETE FROM ' . $reference_array['table_name']
+				. ' WHERE ' . $this->int_pk_name . ' = ' . $this->dba->getTableArray()[$this->int_pk_name]['value'];
+			$this->dba->dbExec($q);
 		}
 		// remove any element list references
 		if (!empty($this->element_list)) {
diff --git a/src/Output/Image.php b/src/Output/Image.php
index 9fd8261..aa44960 100644
--- a/src/Output/Image.php
+++ b/src/Output/Image.php
@@ -256,8 +256,8 @@ class Image
 			}
 			// check resize parameters
 			if ($inc_width > $thumb_width || $inc_height > $thumb_height) {
-				$thumb_width_r = 0;
-				$thumb_height_r = 0;
+				$thumb_width_r = 1;
+				$thumb_height_r = 1;
 				// we need to keep the aspect ration on longest side
 				if (
 					($inc_height > $inc_width &&
@@ -288,6 +288,12 @@ class Image
 					!file_exists($thumbnail_write_path . $thumbnail)
 				) {
 					// image, copy source image, offset in image, source x/y, new size, source image size
+					if ($thumb_width_r < 1) {
+						$thumb_width_r = 1;
+					}
+					if ($thumb_height_r < 1) {
+						$thumb_height_r = 1;
+					}
 					$thumb = imagecreatetruecolor($thumb_width_r, $thumb_height_r);
 					if ($thumb === false) {
 						throw new \RuntimeException(
@@ -380,9 +386,7 @@ class Image
 				}
 			}
 			// add output path
-			if ($thumbnail !== false) {
-				$thumbnail = $thumbnail_web_path . $thumbnail;
-			}
+			$thumbnail = $thumbnail_web_path . $thumbnail;
 		} elseif ($create_dummy === true) {
 			// create dummy image in the thumbnail size
 			// if one side is missing, use the other side to create a square
@@ -399,10 +403,10 @@ class Image
 				!file_exists($thumbnail_write_path . $thumbnail)
 			) {
 				// if both are unset, set to 250
-				if ($thumb_height == 0) {
+				if ($thumb_height < 1) {
 					$thumb_height = 250;
 				}
-				if ($thumb_width == 0) {
+				if ($thumb_width < 1) {
 					$thumb_width = 250;
 				}
 				$thumb = imagecreatetruecolor($thumb_width, $thumb_height);
diff --git a/src/UrlRequests/Curl.php b/src/UrlRequests/Curl.php
index fcc8bc1..ced5129 100644
--- a/src/UrlRequests/Curl.php
+++ b/src/UrlRequests/Curl.php
@@ -599,7 +599,7 @@ class Curl implements Interface\RequestsInterface
 		// for post we set POST option
 		if ($type == "post") {
 			curl_setopt($handle, CURLOPT_POST, true);
-		} elseif (in_array($type, self::CUSTOM_REQUESTS)) {
+		} elseif (!empty($type) && in_array($type, self::CUSTOM_REQUESTS)) {
 			curl_setopt($handle, CURLOPT_CUSTOMREQUEST, strtoupper($type));
 		}
 		// set body data if not null, will send empty [] for empty data
@@ -700,12 +700,12 @@ class Curl implements Interface\RequestsInterface
 		// if we have a timeout signal
 		if (!empty($this->config['timeout'])) {
 			$timeout_requires_no_signal = $this->config['timeout'] < 1;
-			curl_setopt($handle, CURLOPT_TIMEOUT_MS, $this->config['timeout'] * 1000);
+			curl_setopt($handle, CURLOPT_TIMEOUT_MS, (int)round($this->config['timeout'] * 1000));
 		}
 		if (!empty($this->config['connection_timeout'])) {
 			$timeout_requires_no_signal = $timeout_requires_no_signal ||
 				$this->config['connection_timeout'] < 1;
-			curl_setopt($handle, CURLOPT_CONNECTTIMEOUT_MS, $this->config['connection_timeout'] * 1000);
+			curl_setopt($handle, CURLOPT_CONNECTTIMEOUT_MS, (int)round($this->config['connection_timeout'] * 1000, 1));
 		}
 		if ($timeout_requires_no_signal && strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
 			curl_setopt($handle, CURLOPT_NOSIGNAL, true);
diff --git a/test/phpunit/Convert/CoreLibsConvertMathTest.php b/test/phpunit/Convert/CoreLibsConvertMathTest.php
index 6441ca7..5df06aa 100644
--- a/test/phpunit/Convert/CoreLibsConvertMathTest.php
+++ b/test/phpunit/Convert/CoreLibsConvertMathTest.php
@@ -319,6 +319,36 @@ final class CoreLibsConvertMathTest extends TestCase
 					[6, 12, 18],
 				]
 			],
+			'inblanaced [2x2,3] x [3x2]' => [
+				'a' => [
+					[1, 2, 3],
+					[4, 5]
+				],
+				'b' => [
+					[6, 7],
+					[8, 9],
+					[10, 11]
+				],
+				'result' => [
+					[52, 58],
+					[64, 73],
+				]
+			],
+			'inblanaced [2x3] x [3x1,2]' => [
+				'a' => [
+					[1, 2, 3],
+					[4, 5, 7]
+				],
+				'b' => [
+					[7, 8],
+					[9, 10],
+					[11]
+				],
+				'result' => [
+					[58, 28],
+					[150, 82],
+				]
+			],
 		];
 	}