/**
  * Returns the given string length.
  * @since           2.1.2
  */
 public static function getStringLength($sString)
 {
     self::$_bFunctionExists_mb_strlen = isset(self::$_bFunctionExists_mb_strlen) ? self::$_bFunctionExists_mb_strlen : function_exists('mb_strlen');
     return self::$_bFunctionExists_mb_strlen ? mb_strlen($sString) : strlen($sString);
 }