diff --git a/composer.json b/composer.json
index b688dfd..334effc 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": ">=8.1",
+        "php": ">=8.2",
         "psr/log": "^3.0@dev"
     },
     "require-dev": {
diff --git a/src/Check/Email.php b/src/Check/Email.php
index 6e78bee..455a7d2 100644
--- a/src/Check/Email.php
+++ b/src/Check/Email.php
@@ -169,10 +169,10 @@ class Email
 	 * @param  string      $email email string
 	 * @param  bool        $short default false, if true,
 	 *                            returns only short type (pc instead of pc_html)
-	 * @return string|bool        email type, eg "pc", "docomo", etc,
+	 * @return string|false       email type, eg "pc", "docomo", etc,
 	 *                            false for invalid short type
 	 */
-	public static function getEmailType(string $email, bool $short = false)
+	public static function getEmailType(string $email, bool $short = false): string|false
 	{
 		// trip if there is no email address
 		if (!$email) {
@@ -200,9 +200,9 @@ class Email
 	 * gets the short email type from a long email type
 	 *
 	 * @param  string $email_type email string
-	 * @return string|bool              short string or false for invalid
+	 * @return string|false             short string or false for invalid
 	 */
-	public static function getShortEmailType(string $email_type)
+	public static function getShortEmailType(string $email_type): string|false
 	{
 		// check if the short email type exists
 		if (isset(self::$mobile_email_type_short[$email_type])) {
diff --git a/src/Convert/Colors.php b/src/Convert/Colors.php
index b88c6d3..1c6f4b4 100644
--- a/src/Convert/Colors.php
+++ b/src/Convert/Colors.php
@@ -28,7 +28,7 @@ class Colors
 	 * @param  int    $green      green 0-255
 	 * @param  int    $blue       blue 0-255
 	 * @param  bool   $hex_prefix default true, prefix with "#"
-	 * @return string|bool        rgb in hex values with leading # if set,
+	 * @return string|false       rgb in hex values with leading # if set,
 	 *                            false for invalid color
 	 */
 	public static function rgb2hex(
@@ -36,7 +36,7 @@ class Colors
 		int $green,
 		int $blue,
 		bool $hex_prefix = true
-	): string|bool {
+	): string|false {
 		$hex_color = '';
 		if ($hex_prefix === true) {
 			$hex_color = '#';
@@ -58,14 +58,14 @@ class Colors
 	 * @param  string $hexStr           RGB hexstring
 	 * @param  bool   $return_as_string flag to return as string
 	 * @param  string $seperator        string seperator: default: ","
-	 * @return string|array<string,float|int>|bool false on error or array with RGB
-	 *                                             or a string with the seperator
+	 * @return string|array<string,float|int>|false false on error or array with RGB
+	 *                                              or a string with the seperator
 	 */
 	public static function hex2rgb(
 		string $hexStr,
 		bool $return_as_string = false,
 		string $seperator = ','
-	): string|array|bool {
+	): string|array|false {
 		$hexStr = preg_replace("/[^0-9A-Fa-f]/", '', $hexStr); // Gets a proper hex string
 		if (!is_string($hexStr)) {
 			return false;
@@ -97,13 +97,13 @@ class Colors
 	 * returns:
 	 * array with hue (0-360), sat (0-100%), brightness/value (0-100%)
 	 *
-	 * @param  int $red              red 0-255
-	 * @param  int $green            green 0-255
-	 * @param  int $blue             blue 0-255
-	 * @return array<int|float>|bool Hue, Sat, Brightness/Value
-	 *                               false for input value error
+	 * @param  int $red               red 0-255
+	 * @param  int $green             green 0-255
+	 * @param  int $blue              blue 0-255
+	 * @return array<int|float>|false Hue, Sat, Brightness/Value
+	 *                                false for input value error
 	 */
-	public static function rgb2hsb(int $red, int $green, int $blue): array|bool
+	public static function rgb2hsb(int $red, int $green, int $blue): array|false
 	{
 		// check that rgb is from 0 to 255
 		foreach (['red', 'green', 'blue'] as $c) {
@@ -144,13 +144,13 @@ class Colors
 	 * converts HSB/V to RGB values RGB is full INT
 	 * if HSB/V value is invalid, sets this value to 0
 	 *
-	 * @param  float $H          hue 0-360 (int)
-	 * @param  float $S          saturation 0-100 (int)
-	 * @param  float $V          brightness/value 0-100 (int)
-	 * @return array<int>|bool 0 red/1 green/2 blue array as 0-255
-	 *                         false for input value error
+	 * @param  float $H         hue 0-360 (int)
+	 * @param  float $S         saturation 0-100 (int)
+	 * @param  float $V         brightness/value 0-100 (int)
+	 * @return array<int>|false 0 red/1 green/2 blue array as 0-255
+	 *                          false for input value error
 	 */
-	public static function hsb2rgb(float $H, float $S, float $V): array|bool
+	public static function hsb2rgb(float $H, float $S, float $V): array|false
 	{
 		// check that H is 0 to 359, 360 = 0
 		// and S and V are 0 to 1
@@ -230,13 +230,13 @@ class Colors
 	 * return:
 	 * array with hue (0-360), saturation (0-100%) and luminance (0-100%)
 	 *
-	 * @param  int $red          red 0-255
-	 * @param  int $green        green 0-255
-	 * @param  int $blue         blue 0-255
-	 * @return array<float>|bool hue/sat/luminance
-	 *                           false for input value error
+	 * @param  int $red           red 0-255
+	 * @param  int $green         green 0-255
+	 * @param  int $blue          blue 0-255
+	 * @return array<float>|false hue/sat/luminance
+	 *                            false for input value error
 	 */
-	public static function rgb2hsl(int $red, int $green, int $blue): array|bool
+	public static function rgb2hsl(int $red, int $green, int $blue): array|false
 	{
 		// check that rgb is from 0 to 255
 		foreach (['red', 'green', 'blue'] as $c) {
@@ -284,12 +284,12 @@ class Colors
 	 * converts an HSL to RGB
 	 * if HSL value is invalid, set this value to 0
 	 *
-	 * @param  float $hue                hue: 0-360 (degrees)
-	 * @param  float $sat                saturation: 0-100
-	 * @param  float $lum                luminance: 0-100
-	 * @return array<int,float|int>|bool red/blue/green 0-255 each
+	 * @param  float $hue                 hue: 0-360 (degrees)
+	 * @param  float $sat                 saturation: 0-100
+	 * @param  float $lum                 luminance: 0-100
+	 * @return array<int,float|int>|false red/blue/green 0-255 each
 	 */
-	public static function hsl2rgb(float $hue, float $sat, float $lum): array|bool
+	public static function hsl2rgb(float $hue, float $sat, float $lum): array|false
 	{
 		if ($hue == 360) {
 			$hue = 0;
diff --git a/src/Convert/Json.php b/src/Convert/Json.php
index 9686715..7f885df 100644
--- a/src/Convert/Json.php
+++ b/src/Convert/Json.php
@@ -48,8 +48,26 @@ class Json
 		return (array)$json;
 	}
 
+	/**
+	 * convert array to json
+	 * Will set empty json {} on false/error
+	 * Error can be read with jsonGetLastError
+	 * Deos not throw errors
+	 *
+	 * @param  array<mixed> $data
+	 * @param  int          $flags json_encode flags as is
+	 * @return string              JSON string or '{}' if false
+	 */
+	public static function jsonConvertArrayTo(array $data, int $flags = 0): string
+	{
+		$json_string = json_encode($data, $flags) ?: '{}';
+		self::$json_last_error = json_last_error();
+		return (string)$json_string;
+	}
+
 	/**
 	 * returns human readable string for json errors thrown in jsonConvertToArray
+	 * Source: https://www.php.net/manual/en/function.json-last-error.php
 	 *
 	 * @param  bool       $return_string [default=false] if set to true
 	 *                                   it will return the message string and not
@@ -80,6 +98,15 @@ class Json
 			case JSON_ERROR_UTF8:
 				$json_error_string = 'Malformed UTF-8 characters, possibly incorrectly encoded';
 				break;
+			case JSON_ERROR_RECURSION:
+				$json_error_string = 'One or more recursive references in the value to be encoded';
+				break;
+			case JSON_ERROR_INF_OR_NAN:
+				$json_error_string = 'One or more NAN or INF values in the value to be encoded';
+				break;
+			case JSON_ERROR_UNSUPPORTED_TYPE:
+				$json_error_string = '	A value of a type that cannot be encoded was given';
+				break;
 			case JSON_ERROR_INVALID_PROPERTY_NAME:
 				$json_error_string = 'A key starting with \u0000 character was in the string';
 				break;
diff --git a/src/DB/IO.php b/src/DB/IO.php
index eb70690..c92f80f 100644
--- a/src/DB/IO.php
+++ b/src/DB/IO.php
@@ -2779,7 +2779,7 @@ class IO
 	 * @param  string       $query  Query to find in cursor_ext
 	 * @param  array<mixed> $params If the query is params type we need params
 	 *                              data to create a unique call one, optional
-	 * @return int|false            query position (row pos), false on error
+	 * @return int|false            numer of rows returned, false on error
 	 */
 	public function dbGetCursorNumRows(string $query, array $params = []): int|false
 	{
@@ -3736,7 +3736,7 @@ class IO
 	 * Either a single element for a single insert or an array
 	 * if multiple insert values where used.
 	 *
-	 * @return array<mixed>|string|int|null Current insert query primary key
+	 * @return array<mixed>|string|int|null Current insert query primary key, null on not set
 	 */
 	public function dbGetInsertPK(): array|string|int|null
 	{
diff --git a/test/phpunit/Convert/CoreLibsConvertJsonTest.php b/test/phpunit/Convert/CoreLibsConvertJsonTest.php
index af6e7e3..74e7ec7 100644
--- a/test/phpunit/Convert/CoreLibsConvertJsonTest.php
+++ b/test/phpunit/Convert/CoreLibsConvertJsonTest.php
@@ -16,7 +16,7 @@ final class CoreLibsConvertJsonTest extends TestCase
 	/**
 	 * test list for json convert tests
 	 *
-	 * @return array
+	 * @return array<mixed>
 	 */
 	public function jsonProvider(): array
 	{
@@ -54,10 +54,36 @@ final class CoreLibsConvertJsonTest extends TestCase
 		];
 	}
 
+	/**
+	 * Undocumented function
+	 *
+	 * @return array<mixed>
+	 */
+	public function jsonArrayProvider(): array
+	{
+		return [
+			'valid json' => [
+				[
+					'm' => 2,
+					'f' => 'sub_2'
+				],
+				'{"m":2,"f":"sub_2"}',
+			],
+			'empty json array' => [
+				[],
+				'[]'
+			],
+			'empty json hash' => [
+				['' => ''],
+				'{"":""}'
+			]
+		];
+	}
+
 	/**
 	 * json error list
 	 *
-	 * @return array JSON error list
+	 * @return array<mixed> JSON error list
 	 */
 	public function jsonErrorProvider(): array
 	{
@@ -127,7 +153,7 @@ final class CoreLibsConvertJsonTest extends TestCase
 	 *
 	 * @param string|null $input
 	 * @param bool $flag
-	 * @param array $expected
+	 * @param array<mixed> $expected
 	 * @return void
 	 */
 	public function testJsonConvertToArray(?string $input, bool $flag, array $expected): void
@@ -146,7 +172,8 @@ final class CoreLibsConvertJsonTest extends TestCase
 	 * @testdox jsonGetLastError $input will be $expected_i/$expected_s [$_dataName]
 	 *
 	 * @param string|null $input
-	 * @param string $expected
+	 * @param int $expected_i
+	 * @param string $expected_s
 	 * @return void
 	 */
 	public function testJsonGetLastError(?string $input, int $expected_i, string $expected_s): void
@@ -161,6 +188,25 @@ final class CoreLibsConvertJsonTest extends TestCase
 			\CoreLibs\Convert\Json::jsonGetLastError(true)
 		);
 	}
+
+	/**
+	 * Undocumented function
+	 *
+	 * @covers ::jsonConvertArrayTo
+	 * @dataProvider jsonArrayProvider
+	 * @testdox jsonConvertArrayTo $input (Override: $flag) will be $expected [$_dataName]
+	 *
+	 * @param  array<mixed> $input
+	 * @param  string $expected
+	 * @return void
+	 */
+	public function testJsonConvertArrayto(array $input, string $expected): void
+	{
+		$this->assertEquals(
+			$expected,
+			\CoreLibs\Convert\Json::jsonConvertArrayTo($input)
+		);
+	}
 }
 
 // __END__