Replacement for PHP's native {@link \NumberFormatter} class.
 The only methods currently supported in this class are:
  - {@link __construct}
  - {@link create}
  - {@link formatCurrency}
  - {@link format}
  - {@link getAttribute}
  - {@link getErrorCode}
  - {@link getErrorMessage}
  - {@link getLocale}
  - {@link parse}
  - {@link setAttribute}
  
     |   |   __construct(string $locale = 'en', int $style = null, string $pattern = null)  Constructor.   |   | 
   |  static NumberFormatter  |   create(string $locale = 'en', int $style = null, string $pattern = null)  Static constructor.   |   | 
   |  string  |   formatCurrency(float $value, string $currency)  Format a currency value.   |   | 
   |  bool|string  |   format(number $value, int $type = self::TYPE_DEFAULT)  Format a number.   |   | 
   |  bool|int  |   getAttribute(int $attr)  Returns an attribute value.   |   | 
   |  int  |   getErrorCode()  Returns formatter's last error code. Always returns the UZEROERROR class constant value.   |   | 
   |  string  |   getErrorMessage()  Returns formatter's last error message. Always returns the UZEROERROR_MESSAGE class constant value.   |   | 
   |  string  |   getLocale(int $type = Locale::ACTUAL_LOCALE)  Returns the formatter's locale.   |   | 
   |  bool|string  |   getPattern()  Not supported. Returns the formatter's pattern.   |   | 
   |  bool|string  |   getSymbol(int $attr)  Not supported. Returns a formatter symbol value.   |   | 
   |  bool|string  |   getTextAttribute(int $attr)  Not supported. Returns a formatter text attribute value.   |   | 
   |  bool|string  |   parseCurrency(string $value, string $currency, int $position = null)  Not supported. Parse a currency number.   |   | 
   |  int|float|false  |   parse(string $value, int $type = self::TYPE_DOUBLE, int $position)  Parse a number.   |   | 
   |  bool  |   setAttribute(int $attr, int $value)  Set an attribute.   |   | 
   |  bool  |   setPattern(string $pattern)  Not supported. Set the formatter's pattern.   |   | 
   |  bool  |   setSymbol(int $attr, string $value)  Not supported. Set the formatter's symbol.   |   | 
   |  bool  |   setTextAttribute(int $attr, int $value)  Not supported. Set a text attribute.   |   | 
  
                         
    __construct(string $locale = 'en', int $style = null, string $pattern = null)
         
   Constructor.
   Parameters
   | string |  $locale |  The locale code. The only currently supported locale is "en" (or null using the default locale, i.e. "en") |  
  | int |  $style |  Style of the formatting, one of the format style constants The only supported styles are NumberFormatter::DECIMAL and NumberFormatter::CURRENCY. |  
  | string |  $pattern |  Not supported. A pattern string in case $style is NumberFormat::PATTERNDECIMAL or NumberFormat::PATTERNRULEBASED. It must conform to the syntax described in the ICU DecimalFormat or ICU RuleBasedNumberFormat documentation |  
 
 Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.create.php |   |  
  | http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details |   |  
  | http://www.icu-project.org/apiref/icu4c/classRuleBasedNumberFormat.html#_details |   |  
 
               static            NumberFormatter
    create(string $locale = 'en', int $style = null, string $pattern = null)
         
   Static constructor.
   Parameters
   | string |  $locale |  The locale code. The only supported locale is "en" (or null using the default locale, i.e. "en") |  
  | int |  $style |  Style of the formatting, one of the format style constants The only currently supported styles are NumberFormatter::DECIMAL and NumberFormatter::CURRENCY. |  
  | string |  $pattern |  Not supported. A pattern string in case $style is NumberFormat::PATTERNDECIMAL or NumberFormat::PATTERNRULEBASED. It must conform to the syntax described in the ICU DecimalFormat or ICU RuleBasedNumberFormat documentation |  
 
 Return Value
  Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.create.php |   |  
  | http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details |   |  
  | http://www.icu-project.org/apiref/icu4c/classRuleBasedNumberFormat.html#_details |   |  
 
        Format a currency value.
   Parameters
   | float |  $value |  The numeric currency value |  
  | string |  $currency |  The 3-letter ISO 4217 currency code indicating the currency to use |  
 
 Return Value
   | string |  The formatted currency value |  
 
 See also
   | http://www.php.net/manual/en/numberformatter.formatcurrency.php |   |  
  | https://en.wikipedia.org/wiki/ISO_4217#Active_codes |   |  
 
        Format a number.
   Parameters
   | number |  $value |  The value to format |  
  | int |  $type |  Type of the formatting, one of the format type constants Only type NumberFormatter::TYPE_DEFAULT is currently supported. |  
 
 Return Value
   | bool|string |  The formatted value or false on error |  
 
 Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.format.php |   |  
 
                           bool|int
    getAttribute(int $attr)
         
   Returns an attribute value.
   Parameters
   | int |  $attr |  An attribute specifier, one of the numeric attribute constants |  
 
 Return Value
   | bool|int |  The attribute value on success or false on error |  
 
 See also
   | http://www.php.net/manual/en/numberformatter.getattribute.php |   |  
 
                           int
    getErrorCode()
         
   Returns formatter's last error code. Always returns the UZEROERROR class constant value.
   Return Value
   | int |  The error code from last formatter call |  
 
 See also
   | http://www.php.net/manual/en/numberformatter.geterrorcode.php |   |  
 
                           string
    getErrorMessage()
         
   Returns formatter's last error message. Always returns the UZEROERROR_MESSAGE class constant value.
   Return Value
   | string |  The error message from last formatter call |  
 
 See also
   | http://www.php.net/manual/en/numberformatter.geterrormessage.php |   |  
 
                           string
    getLocale(int $type = Locale::ACTUAL_LOCALE)
         
   Returns the formatter's locale.
 The parameter $type is currently ignored.
   Parameters
   | int |  $type |  Not supported. The locale name type to return (Locale::VALIDLOCALE or Locale::ACTUALLOCALE) |  
 
 Return Value
   | string |  The locale used to create the formatter. Currently always returns "en". |  
 
 See also
   | http://www.php.net/manual/en/numberformatter.getlocale.php |   |  
 
                           bool|string
    getPattern()
         
   Not supported. Returns the formatter's pattern.
   Return Value
   | bool|string |  The pattern string used by the formatter or false on error |  
 
 Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.getpattern.php |   |  
 
                           bool|string
    getSymbol(int $attr)
         
   Not supported. Returns a formatter symbol value.
   Parameters
   | int |  $attr |  A symbol specifier, one of the format symbol constants |  
 
 Return Value
   | bool|string |  The symbol value or false on error |  
 
 See also
   | http://www.php.net/manual/en/numberformatter.getsymbol.php |   |  
 
                           bool|string
    getTextAttribute(int $attr)
         
   Not supported. Returns a formatter text attribute value.
   Parameters
   | int |  $attr |  An attribute specifier, one of the text attribute constants |  
 
 Return Value
   | bool|string |  The attribute value or false on error |  
 
 See also
   | http://www.php.net/manual/en/numberformatter.gettextattribute.php |   |  
 
                           bool|string
    parseCurrency(string $value, string $currency, int $position = null)
         
   Not supported. Parse a currency number.
   Parameters
   | string |  $value |  The value to parse |  
  | string |  $currency |  Parameter to receive the currency name (reference) |  
  | int |  $position |  Offset to begin the parsing on return this value will hold the offset at which the parsing ended |  
 
 Return Value
   | bool|string |  The parsed numeric value of false on error |  
 
 Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.parsecurrency.php |   |  
 
                           int|float|false
    parse(string $value, int $type = self::TYPE_DOUBLE, int $position)
         
   Parse a number.
   Parameters
   | string |  $value |  The value to parse |  
  | int |  $type |  Type of the formatting, one of the format type constants. NumberFormatter::TYPE_DOUBLE by default |  
  | int |  $position |  Offset to begin the parsing on return this value will hold the offset at which the parsing ended |  
 
 Return Value
   | int|float|false |  The parsed value of false on error |  
 
 See also
   | http://www.php.net/manual/en/numberformatter.parse.php |   |  
 
                           bool
    setAttribute(int $attr, int $value)
         
   Set an attribute.
   Parameters
   | int |  $attr |  An attribute specifier, one of the numeric attribute constants The only currently supported attributes are NumberFormatter::FRACTIONDIGITS, NumberFormatter::GROUPINGUSED and NumberFormatter::ROUNDING_MODE. |  
  | int |  $value |  The attribute value |  
 
 Return Value
   | bool |  true on success or false on failure |  
 
 Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.setattribute.php |   |  
 
                           bool
    setPattern(string $pattern)
         
   Not supported. Set the formatter's pattern.
   Parameters
   | string |  $pattern |  A pattern string in conformance with the ICU DecimalFormat documentation |  
 
 Return Value
   | bool |  true on success or false on failure |  
 
 Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.setpattern.php |   |  
  | http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details |   |  
 
                           bool
    setSymbol(int $attr, string $value)
         
   Not supported. Set the formatter's symbol.
   Parameters
   | int |  $attr |  A symbol specifier, one of the format symbol constants |  
  | string |  $value |  The value for the symbol |  
 
 Return Value
   | bool |  true on success or false on failure |  
 
 Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.setsymbol.php |   |  
 
                           bool
    setTextAttribute(int $attr, int $value)
         
   Not supported. Set a text attribute.
   Parameters
   | int |  $attr |  An attribute specifier, one of the text attribute constants |  
  | int |  $value |  The attribute value |  
 
 Return Value
   | bool |  true on success or false on failure |  
 
 Exceptions
  See also
   | http://www.php.net/manual/en/numberformatter.settextattribute.php |   |