diff --git a/src/EmailHelper.php b/src/EmailHelper.php
index 9d80587..45d1a8c 100644
--- a/src/EmailHelper.php
+++ b/src/EmailHelper.php
@@ -24,23 +24,23 @@ class EmailHelper
      *
      * Проверка валидности email адреса.
      *
-     * @param string $sString
+     * @param string|null $string
      *
      * @return bool
      */
-    public static function isEmailValid(?string $sString = ''): bool
+    public static function isEmailValid(?string $string = ''): bool
     {
-        if ('' === $sString || \is_null($sString)) {
+        if (null === $string || '' === $string) {
             return false;
         }
 
         // According to the FQDN add a dot to the end of the string and check if the domain has an mx record
-        if (\function_exists('filter_var') && \filter_var($sString, FILTER_VALIDATE_EMAIL) && \checkdnsrr(\ltrim(\stristr($sString, '@'), '@') . '.', 'MX')) {
+        if (\function_exists('filter_var') && \filter_var($string, FILTER_VALIDATE_EMAIL) && \checkdnsrr(\ltrim(\stristr($string, '@'), '@') . '.', 'MX')) {
             return true;
         }
 
         // Сheck using a regular expression if the filter_var() function does not exist
-        if (\preg_match('/^[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/sD', $sString) && \preg_match('/@.+\./', $sString) && \checkdnsrr(\ltrim(\stristr($sString, '@'), '@') . '.', 'MX')) {
+        if (\preg_match('/^[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/sD', $string) && \preg_match('/@.+\./', $string) && \checkdnsrr(\ltrim(\stristr($string, '@'), '@') . '.', 'MX')) {
             return true;
         }
 
diff --git a/src/FileHelper.php b/src/FileHelper.php
index 644fa1b..546fb42 100644
--- a/src/FileHelper.php
+++ b/src/FileHelper.php
@@ -22,14 +22,14 @@ class FileHelper
      * Gets name of the filename only (without dot and extension).
      * If the file name contains several dots (file.name.ext) - return all parts before the last dot.
      *
-     * @param string $sFilename
+     * @param string|null $sFilename
      * @param string $default
      *
      * @return string
      */
     public static function getFileNameOnly(?string $sFilename = '', string $default = ''): string
     {
-        if ('' === $sFilename || \is_null($sFilename)) {
+        if (null === $sFilename || '' === $sFilename) {
             return $default;
         }
 
@@ -41,14 +41,14 @@ public static function getFileNameOnly(?string $sFilename = '', string $default
     /**
      * Gets filename extension only (without dot and name)
      *
-     * @param string $sFilename
+     * @param string|null $sFilename
      * @param string $default
      *
      * @return string
      */
     public static function getFileExtOnly(?string $sFilename = '', string $default = ''): string
     {
-        if ('' === $sFilename || \is_null($sFilename)) {
+        if (null === $sFilename || '' === $sFilename) {
             return $default;
         }
 
@@ -56,4 +56,32 @@ public static function getFileExtOnly(?string $sFilename = '', string $default =
 
         return $sParsed ? $sParsed : $default;
     }
+
+    /**
+     * Converts file size in bytes into human readable file size.
+     *
+     * Конвертация размера файла в удобный для чтения формат.
+     *
+     * @param mixed|null $bytes
+     * @param int        $decimals
+     *
+     * @return string human readable file size (2.87 MB)
+     *
+     * @author evgenij at kostanay dot kz
+     *
+     * @edit   Leonid Sheikman <leonid@sheikman.ru>
+     */
+    public static function getHumanFileSize(?mixed $bytes, int $decimals = 2): string
+    {
+        if (null === $bytes) {
+            return '0';
+        }
+
+        $factor = \floor((\strlen((string) $bytes) - 1) / 3);
+        if ($factor > 0) {
+            $sz = 'KMGT';
+        }
+
+        return \sprintf("%.{$decimals}f", (float) $bytes / \pow(1024, $factor)) . ' ' . @$sz[$factor - 1] . 'B';
+    }
 }
diff --git a/src/PhoneHelper.php b/src/PhoneHelper.php
index 5541a4f..b598073 100644
--- a/src/PhoneHelper.php
+++ b/src/PhoneHelper.php
@@ -57,7 +57,7 @@ public static function formatRussianMobilePhoneNumber(?string $phoneNumber): ?st
      * Функция принимает телефонный номер в произвольном формате и возвращает телефонный
      * номер в формате +7xxxxxxxxxx или false, если входной номер телефона не проходит проверку валидности.
      *
-     * @param string $sString
+     * @param string|null $string
      *
      * @return bool|string
      *
@@ -65,25 +65,25 @@ public static function formatRussianMobilePhoneNumber(?string $phoneNumber): ?st
      *
      * @edit   Leonid Sheikman (leonid74)
      */
-    public static function getValidRusPhone(?string $sString = '')
+    public static function getValidRusPhone(?string $string = '')
     {
-        if ('' === $sString || \is_null($sString)) {
+        if (null === $string || '' === $string) {
             return false;
         }
 
-        $sString = \preg_replace('#[^0-9+]+#uis', '', \trim((string) $sString));
+        $string = \preg_replace('#[^0-9+]+#uis', '', \trim((string) $string));
 
-        if (!\preg_match('#^(?:\\+?7|8|)(.*?)$#uis', $sString, $aTmp)) {
+        if (!\preg_match('#^(?:\\+?7|8|)(.*?)$#uis', $string, $aTmp)) {
             return false;
         }
 
-        $sString = '+7' . \preg_replace('#[^0-9]+#uis', '', $aTmp[1]);
+        $string = '+7' . \preg_replace('#[^0-9]+#uis', '', $aTmp[1]);
 
-        if (!\preg_match('#^\\+7[0-9]{10}$#uis', $sString, $aTmp)) {
+        if (!\preg_match('#^\\+7[0-9]{10}$#uis', $string, $aTmp)) {
             return false;
         }
 
-        return $sString;
+        return $string;
     }
 
     /**
@@ -91,20 +91,20 @@ public static function getValidRusPhone(?string $sString = '')
      *
      * Проверка номера телефона на существование через sms.ru
      *
-     * @param string $sString
+     * @param string $string
      * @param string $apiToken
      * @param string $apiSmsId API Key to SMS.RU
      *
      * @return stdClass()
      */
-    public static function isPhoneExist(string $sString, string $apiToken)
+    public static function isPhoneExist(string $string, string $apiToken)
     {
         $oResult               = new \stdClass();
-        $oResult->phone        = $sString;
+        $oResult->phone        = $string;
         $oResult->phone_exists = 'unknown';
         $oResult->is_error     = false;
 
-        if (empty($sString)) {
+        if (empty($string)) {
             $oResult->phone_exists = false;
 
             return $oResult;
@@ -115,7 +115,7 @@ public static function isPhoneExist(string $sString, string $apiToken)
             $i = 1;
             do {
                 $json = \json_decode(
-                    \file_get_contents("https://sms.ru/sms/cost?api_id={$apiToken}&to={$sString}&msg=" . \urlencode('Test' . \microtime(true)) . '&json=1')
+                    \file_get_contents("https://sms.ru/sms/cost?api_id={$apiToken}&to={$string}&msg=" . \urlencode('Test' . \microtime(true)) . '&json=1')
                 );
 
                 if ((\json_last_error() === JSON_ERROR_NONE) && $json) {
diff --git a/src/StringHelper.php b/src/StringHelper.php
index b40ae34..ffe9472 100644
--- a/src/StringHelper.php
+++ b/src/StringHelper.php
@@ -114,7 +114,7 @@ public static function mb_substr_replace(string $string, string $replacement, in
     // @codingStandardsIgnoreLine
     public static function mb_strlen(?string $string = ''): int
     {
-        if ('' === $string || \is_null($string)) {
+        if (null === $string || '' === $string) {
             return 0;
         }
 
@@ -124,10 +124,10 @@ public static function mb_strlen(?string $string = ''): int
     }
 
     // @codingStandardsIgnoreLine
-    public static function mb_strtolower(?string $string = '', ?string $sDefault = ''): string
+    public static function mb_strtolower(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         return \function_exists('mb_strtolower')
@@ -136,10 +136,10 @@ public static function mb_strtolower(?string $string = '', ?string $sDefault = '
     }
 
     // @codingStandardsIgnoreLine
-    public static function mb_strtoupper(?string $string = '', ?string $sDefault = ''): string
+    public static function mb_strtoupper(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         return \function_exists('mb_strtoupper')
@@ -148,20 +148,20 @@ public static function mb_strtoupper(?string $string = '', ?string $sDefault = '
     }
 
     // @codingStandardsIgnoreLine
-    public static function mb_ucfirst(?string $string = '', ?string $sDefault = ''): string
+    public static function mb_ucfirst(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         return self::mb_strtoupper(self::mb_substr($string, 0, 1)) . self::mb_substr($string, 1);
     }
 
     // @codingStandardsIgnoreLine
-    public static function mb_convert_case(?string $string = '', ?string $sDefault = ''): string
+    public static function mb_convert_case(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         return \function_exists('mb_convert_case')
@@ -170,50 +170,50 @@ public static function mb_convert_case(?string $string = '', ?string $sDefault =
     }
 
     // @codingStandardsIgnoreLine
-    public static function htmlspecialchars(?string $string = '', ?string $sDefault = ''): string
+    public static function htmlspecialchars(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         return \htmlspecialchars($string, ENT_COMPAT | ENT_SUBSTITUTE | ENT_HTML5, static::$defaultEncoding);
     }
 
     // @codingStandardsIgnoreLine
-    public static function htmlspecialchars_decode(?string $string = '', ?string $sDefault = ''): string
+    public static function htmlspecialchars_decode(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         return \htmlspecialchars_decode($string, ENT_COMPAT | ENT_HTML5);
     }
 
     // @codingStandardsIgnoreLine
-    public static function htmlentities(?string $string = '', ?string $sDefault = ''): string
+    public static function htmlentities(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         return \htmlentities($string, ENT_COMPAT | ENT_SUBSTITUTE | ENT_HTML5, static::$defaultEncoding);
     }
 
     // @codingStandardsIgnoreLine
-    public static function html_entity_decode(?string $string = '', ?string $sDefault = ''): string
+    public static function html_entity_decode(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         return \html_entity_decode($string, ENT_COMPAT | ENT_HTML5, static::$defaultEncoding);
     }
 
     // @codingStandardsIgnoreLine
-    public static function utf8_urldecode(?string $string = '', ?string $sDefault = ''): string
+    public static function utf8_urldecode(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $string || \is_null($string)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
         $string = \preg_replace('/%u([0-9a-f]{3,4})/i', '&#x\\1;', \urldecode($string));
@@ -226,18 +226,18 @@ public static function utf8_urldecode(?string $string = '', ?string $sDefault =
      *
      * Добавление BOM в начало строки
      *
-     * @param string $sString
-     * @param string $sDefault
+     * @param string $string
+     * @param string $default
      *
      * @return string
      */
-    public static function addBOM(?string $sString = '', ?string $sDefault = ''): string
+    public static function addBOM(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $sString || \is_null($sString)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
-        return \chr(0xEF) . \chr(0xBB) . \chr(0xBF) . $sString;
+        return \chr(0xEF) . \chr(0xBB) . \chr(0xBF) . $string;
     }
 
     /**
@@ -245,18 +245,18 @@ public static function addBOM(?string $sString = '', ?string $sDefault = ''): st
      *
      * Удаление BOM из начала строки
      *
-     * @param string $sString
-     * @param string $sDefault
+     * @param string $string
+     * @param string $default
      *
      * @return string
      */
-    public static function removeBOM(?string $sString = '', ?string $sDefault = ''): string
+    public static function removeBOM(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $sString || \is_null($sString)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
-        return 0 === \strncasecmp(\pack('CCC', 0xEF, 0xBB, 0xBF), $sString, 3) ? \mb_substr($sString, 3) : $sString;
+        return 0 === \strncasecmp(\pack('CCC', 0xEF, 0xBB, 0xBF), $string, 3) ? \mb_substr($string, 3) : $string;
     }
 
     /**
@@ -264,18 +264,18 @@ public static function removeBOM(?string $sString = '', ?string $sDefault = ''):
      *
      * Замена <br> на \n.
      *
-     * @param string $sString
-     * @param string $sDefault
+     * @param string $string
+     * @param string $default
      *
      * @return string
      */
-    public static function br2nl(?string $sString = '', ?string $sDefault = ''): string
+    public static function br2nl(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $sString || \is_null($sString)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
-        return \preg_replace('/\<br(\s*)?\/?\>/i', "\n", $sString);
+        return \preg_replace('/\<br(\s*)?\/?\>/i', "\n", $string);
     }
 
     /**
@@ -286,24 +286,24 @@ public static function br2nl(?string $sString = '', ?string $sDefault = ''): str
      * StringHelper::truncateString('Lorem ipsum inum', 10);         // returns 'Lorem i...'
      * StringHelper::truncateString('Lorem ipsum inum', 15, '>>>');  // returns 'Lorem ipsum >>>'
      *
-     * @param string $sString
+     * @param string $string
      * @param int    $iLength  (defaults to 100)
      * @param string $sSuffix  (optional, defaults to '...')
-     * @param string $sDefault
+     * @param string $default
      *
      * @return string
      */
-    public static function truncateString(?string $sString = '', ?int $iLength = 100, ?string $sSuffix = '...', ?string $sDefault = ''): string
+    public static function truncateString(?string $string = '', ?int $iLength = 100, ?string $sSuffix = '...', ?string $default = ''): string
     {
-        if ('' === $sString || \is_null($sString)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
-        if ($iLength <= 0 || \mb_strlen($sString) <= $iLength) {
-            return $sString;
+        if ($iLength <= 0 || \mb_strlen($string) <= $iLength) {
+            return $string;
         }
 
-        return \mb_substr($sString, 0, $iLength - \mb_strlen($sSuffix)) . $sSuffix;
+        return \mb_substr($string, 0, $iLength - \mb_strlen($sSuffix)) . $sSuffix;
     }
 
     /**
@@ -385,24 +385,24 @@ public static function hidingData($data = null, array $aDataToHide = []): string
      *
      * Проверка, закодирована ли строка в формате Base64
      *
-     * @param ?string $sString
+     * @param ?string $string
      * @param array   $enc
      * @param string  $data
      *
      * @return bool
      */
-    public static function isBase64Encoded(?string $sString = '', ?array $enc = ['UTF-8', 'ASCII']): bool
+    public static function isBase64Encoded(?string $string = '', ?array $enc = ['UTF-8', 'ASCII']): bool
     {
-        if ('' === $sString || \is_null($sString)) {
+        if (null === $string || '' === $string) {
             return false;
         }
 
         try {
-            if (!\preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $sString)) {
+            if (!\preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $string)) {
                 return false;
             }
 
-            $sDecoded = \base64_decode($sString, true);
+            $sDecoded = \base64_decode($string, true);
             if (false === $sDecoded) {
                 return false;
             }
@@ -422,18 +422,18 @@ public static function isBase64Encoded(?string $sString = '', ?array $enc = ['UT
      *
      * Возвращает транслитерированную строку (исходно содержащую символы á é ò и т.п.), содержащую только латинские символы
      *
-     * @param string $sString
-     * @param string $sDefault
+     * @param string $string
+     * @param string $default
      *
      * @return string
      */
-    public static function toLatinString(?string $sString = '', ?string $sDefault = ''): string
+    public static function toLatinString(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $sString || \is_null($sString)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
-        return \transliterator_transliterate('Any-Latin; Latin-ASCII; [\u0180-\u7fff] remove', $sString);
+        return \transliterator_transliterate('Any-Latin; Latin-ASCII; [\u0180-\u7fff] remove', $string);
     }
 
     /**
@@ -447,22 +447,22 @@ public static function toLatinString(?string $sString = '', ?string $sDefault =
      *  - двойные пробелы заменяются на один
      *  - удаляются пробелы в начале и конце строки
      *
-     * @param string $sString
-     * @param string $sDefault
+     * @param string $string
+     * @param string $default
      *
      * @return string
      */
-    public static function minClean(?string $sString = '', ?string $sDefault = ''): string
+    public static function minClean(?string $string = '', ?string $default = ''): string
     {
-        if ('' === $sString || \is_null($sString)) {
-            return $sDefault;
+        if (null === $string || '' === $string) {
+            return $default;
         }
 
-        $sString = \str_ireplace(["\0", '\\a', '\\b', "\v", "\e", "\f", "\t", "\r", "\n"], ' ', $sString);
-        $sString = \preg_replace('/[\s]{2,}/', ' ', $sString);
-        $sString = \trim($sString);
+        $string = \str_ireplace(["\0", '\\a', '\\b', "\v", "\e", "\f", "\t", "\r", "\n"], ' ', $string);
+        $string = \preg_replace('/[\s]{2,}/', ' ', $string);
+        $string = \trim($string);
 
-        return (0 == \mb_strlen($sString, static::$defaultEncoding)) ? $sDefault : $sString;
+        return (0 == \mb_strlen($string, static::$defaultEncoding)) ? $default : $string;
     }
 
     /**
@@ -600,30 +600,30 @@ public static function replaceStringInFile(string $filename, string $searchStrin
      * the string is trimmed up to the previous word. If no spaces are found within
      * the limit, or if the first word exceeds the limit, an empty string is returned.
      *
-     * @param string|null $sString   the input string to be trimmed
+     * @param string|null $string    the input string to be trimmed
      * @param int         $maxLength the maximum allowed length of the output string
-     * @param string      $sDefault  default value
+     * @param string      $default  default value
      *
      * @return string the trimmed string with preserved last word integrity up to maxLength
      */
-    public static function trimStringToLastWord(?string $sString = '', int $maxLength = 0, string $sDefault = ''): string
+    public static function trimStringToLastWord(?string $string = '', int $maxLength = 0, string $default = ''): string
     {
-        if ('' === $sString || null === $sString || 0 == $maxLength) {
-            return $sDefault;
+        if (null === $string || '' === $string || 0 == $maxLength) {
+            return $default;
         }
 
-        $sString = \trim($sString);
+        $string = \trim($string);
 
         // Return the original string if it is within maxLength.
-        if (static::mb_strlen($sString) <= $maxLength) {
-            return $sString;
+        if (static::mb_strlen($string) <= $maxLength) {
+            return $string;
         }
 
         // Trim the string to maxLength first to see if we're cutting through a word.
-        $trimmedString = static::mb_substr($sString, 0, $maxLength);
+        $trimmedString = static::mb_substr($string, 0, $maxLength);
 
         // Check if we are on a space or just passed one; if so, we can return early.
-        if ($sString[$maxLength] == ' ' || $sString[$maxLength - 1] == ' ') {
+        if ($string[$maxLength] == ' ' || $string[$maxLength - 1] == ' ') {
             return \rtrim($trimmedString);
         }
 
@@ -632,13 +632,43 @@ public static function trimStringToLastWord(?string $sString = '', int $maxLengt
 
         // If there's no space at all, return an empty string as we cannot preserve any word.
         if ($lastSpacePosition === false) {
-            return $sDefault;
+            return $default;
         }
 
         // Return substring up to the last found space position.
         return static::mb_substr($trimmedString, 0, $lastSpacePosition);
     }
 
+    /**
+     * Split string with full name (LFS) into 3 parts, remove multiple spaces.
+     *
+     * Разбиваем строку с ФИО на 3 части, удаляем множественные пробелы.
+     *
+     * @param string|null $string string with full name
+     *
+     * @return array
+     *
+     * @author Leonid Sheikman <leonid@sheikman.ru>
+     */
+    public function splitFullname(?string $string = ''): array
+    {
+        if (null === $string || '' === $string) {
+            return [];
+        }
+
+        $dataRaw = \explode(' ', \trim(\preg_replace('/[\s]{2,}/', ' ', $string)));
+        $data    = [
+            'lastname'   => $dataRaw[0] ?? '',
+            'firstname'  => $dataRaw[1] ?? '',
+            'secondname' => $dataRaw[2] ?? '',
+        ];
+        $data['fullname_lfs'] = $data['lastname'] . ($data['firstname'] ? ' ' . $data['firstname'] : '') . ($data['secondname'] ? ' ' . $data['secondname'] : '');
+        $data['fullname_lf']  = $data['lastname'] . ($data['firstname'] ? ' ' . $data['firstname'] : '');
+        $data['fullname_fl']  = $data['firstname'] . ($data['lastname'] ? ' ' . $data['lastname'] : '');
+
+        return $data;
+    }
+
     /**
      * Escapes HTML special characters in a string by replacing predefined entities (for Telegram purposes).
      *
diff --git a/src/UrlHelper.php b/src/UrlHelper.php
index 93febcb..1b9c3f9 100644
--- a/src/UrlHelper.php
+++ b/src/UrlHelper.php
@@ -24,13 +24,13 @@ class UrlHelper
      * UrlHelper::addTrailingSlash('https://aaa.bbb.ccc');   // returns 'https://aaa.bbb.ccc/'
      * UrlHelper::addTrailingSlash('https://aaa.bbb.ccc/');  // returns 'https://aaa.bbb.ccc/'
      *
-     * @param string $sUrl
+     * @param string|null $sUrl
      *
      * @return string
      */
     public static function addTrailingSlash(?string $sUrl = ''): string
     {
-        if ('' === $sUrl || \is_null($sUrl)) {
+        if (null === $sUrl || '' === $sUrl) {
             return '/';
         }
 
@@ -42,13 +42,13 @@ public static function addTrailingSlash(?string $sUrl = ''): string
      *
      * UrlHelper::removeTrailingSlash('https://aaa.bbb.ccc/');  // returns 'https://aaa.bbb.ccc'
      *
-     * @param string $sUrl
+     * @param string|null $sUrl
      *
      * @return string
      */
     public static function removeTrailingSlash(?string $sUrl = ''): string
     {
-        if ('' === $sUrl || \is_null($sUrl)) {
+        if (null === $sUrl || '' === $sUrl) {
             return '';
         }
 
@@ -61,13 +61,13 @@ public static function removeTrailingSlash(?string $sUrl = ''): string
      * UrlHelper::prependSlash('aaa/bbb/ccc');   // returns '/aaa/bbb/ccc'
      * UrlHelper::prependSlash('/aaa/bbb/ccc');  // returns '/aaa/bbb/ccc'
      *
-     * @param string $sUrl
+     * @param string|null $sUrl
      *
      * @return string
      */
     public static function prependSlash(?string $sUrl = ''): string
     {
-        if ('' === $sUrl || \is_null($sUrl)) {
+        if (null === $sUrl || '' === $sUrl) {
             return '/';
         }
 
@@ -79,13 +79,13 @@ public static function prependSlash(?string $sUrl = ''): string
      *
      * UrlHelper::getHostOnly('https://aaa.bbb.ccc:9090/path?arg=value#anchor');  // returns 'aaa.bbb.ccc'
      *
-     * @param string $sUrl
+     * @param string|null $sUrl
      *
      * @return string
      */
     public static function getHostOnly(?string $sUrl = ''): string
     {
-        if ('' === $sUrl || \is_null($sUrl)) {
+        if (null === $sUrl || '' === $sUrl) {
             return '';
         }
 
@@ -99,13 +99,13 @@ public static function getHostOnly(?string $sUrl = ''): string
      *
      * UrlHelper::getHostWithScheme('https://aaa.bbb.ccc:9090/path?arg=value#anchor');  // returns 'https://aaa.bbb.ccc'
      *
-     * @param string $sUrl
+     * @param string|null $sUrl
      *
      * @return string
      */
     public static function getHostWithScheme(?string $sUrl = ''): string
     {
-        if ('' === $sUrl || \is_null($sUrl)) {
+        if (null === $sUrl || '' === $sUrl) {
             return '';
         }
 
@@ -119,13 +119,13 @@ public static function getHostWithScheme(?string $sUrl = ''): string
      *
      * UrlHelper::getHostWithSchemeAndPath('https://aaa.bbb.ccc:9090/path?arg=value#anchor');  // returns 'https://aaa.bbb.ccc/path'
      *
-     * @param string $sUrl
+     * @param string|null $sUrl
      *
      * @return string
      */
     public static function getHostWithSchemeAndPath(?string $sUrl = ''): string
     {
-        if ('' === $sUrl || \is_null($sUrl)) {
+        if (null === $sUrl || '' === $sUrl) {
             return '';
         }
 
@@ -133,4 +133,36 @@ public static function getHostWithSchemeAndPath(?string $sUrl = ''): string
 
         return $aParsedUrl['scheme'] . '://' . ($aParsedUrl['host'] ? $aParsedUrl['host'] . $aParsedUrl['path'] : \array_shift(\explode('/', $aParsedUrl['path'], 2)));
     }
+
+    /**
+     * base64 variant encoding with replace characters (=+/) in result string
+     *
+     * @param string|null $sUrl string to encode
+     *
+     * @return string encoded base64url string
+     */
+    public static function base64EncodeUrl(?string $sUrl = ''): string
+    {
+        if (null === $sUrl || '' === $sUrl) {
+            return '';
+        }
+
+        return \str_replace(['+', '/', '='], ['-', '_', ''], \base64_encode($sUrl));
+    }
+
+    /**
+     * base64 variant decoding with replace characters (-_) in result string
+     *
+     * @param string|null $sUrl string to decode
+     *
+     * @return string decoded base64url string
+     */
+    public static function base64DecodeUrl(?string $sUrl = ''): string
+    {
+        if (null === $sUrl || '' === $sUrl) {
+            return '';
+        }
+
+        return \base64_decode(\str_replace(['-', '_'], ['+', '/'], $sUrl));
+    }
 }