CNumberFormatter
CNumberFormatter provides number localization functionalities.
CNumberFormatter formats a number (integer or float) and outputs a string based on the specified format. A CNumberFormatter instance is associated with a locale, and thus generates the string representation of the number in a locale-dependent fashion.
CNumberFormatter currently supports currency format, percentage format, decimal format, and custom format. The first three formats are specified in the locale data, while the custom format allows you to enter an arbitrary format string.
A format string may consist of the following special characters:
- dot (.): the decimal point. It will be replaced with the localized decimal point.
- comma (,): the grouping separator. It will be replaced with the localized grouping separator.
- zero (0): required digit. This specifies the places where a digit must appear (will pad 0 if not).
- hash (#): optional digit. This is mainly used to specify the location of decimal point and grouping separators.
- currency (¤): the currency placeholder. It will be replaced with the localized currency symbol.
- percentage (%): the percentage mark. If appearing, the number will be multiplied by 100 before being formatted.
- permillage (‰): the permillage mark. If appearing, the number will be multiplied by 1000 before being formatted.
- semicolon (;): the character separating positive and negative number sub-patterns.
Anything surrounding the pattern (or sub-patterns) will be kept.
The followings are some examples:
Pattern "#,##0.00" will format 12345.678 as "12,345.68".
Pattern "#,#,#0.00" will format 12345.6 as "1,2,3,45.60".
Note, in the first example, the number is rounded first before applying the formatting. And in the second example, the pattern specifies two grouping sizes.
CNumberFormatter attempts to implement number formatting according to the
Unicode Technical Standard #35. The following features are NOT implemented:
- significant digit
- scientific format
- arbitrary literal characters
- arbitrary padding
Protected Methods
Method |
Description |
Defined By |
formatNumber() | Formats a number based on a format. | CNumberFormatter |
parseFormat() | Parses a given string pattern. | CNumberFormatter |
Method Details
public void __construct(mixed $locale) |
$locale | mixed | locale ID (string) or CLocale instance |
Constructor.
public string format(string $pattern, mixed $value, string $currency=NULL) |
$pattern | string | format pattern |
$value | mixed | the number to be formatted |
$currency | string | 3-letter ISO 4217 code. For example, the code "USD" represents the US Dollar and "EUR" represents the Euro currency. The currency placeholder in the pattern will be replaced with the currency symbol. If null, no replacement will be done. |
{return} | string | the formatting result. |
Source Code: framework/i18n/CNumberFormatter.php#90 (
show)
public function format($pattern,$value,$currency=null)
{
$format=$this->parseFormat($pattern);
$result=$this->formatNumber($format,$value);
if($currency===null)
return $result;
elseif(($symbol=$this->_locale->getCurrencySymbol($currency))===null)
$symbol=$currency;
return str_replace('¤',$symbol,$result);
}
Formats a number based on the specified pattern. Note, if the format contains '%', the number will be multiplied by 100 first. If the format contains '‰', the number will be multiplied by 1000. If the format contains currency placeholder, it will be replaced by the specified localized currency symbol.
public string formatCurrency(mixed $value, string $currency) |
$value | mixed | the number to be formatted |
$currency | string | 3-letter ISO 4217 code. For example, the code "USD" represents the US Dollar and "EUR" represents the Euro currency. The currency placeholder in the pattern will be replaced with the currency symbol. |
{return} | string | the formatting result. |
Formats a number using the currency format defined in the locale.
public string formatDecimal(mixed $value) |
$value | mixed | the number to be formatted |
{return} | string | the formatting result. |
Formats a number using the decimal format defined in the locale.
protected string formatNumber(array $format, mixed $value) |
$format | array | format with the following structure:
array(
// number of required digits after the decimal point,
// will be padded with 0 if not enough digits,
// -1 means we should drop the decimal point
'decimalDigits'=>2,
// maximum number of digits after the decimal point,
// additional digits will be truncated.
'maxDecimalDigits'=>3,
// number of required digits before the decimal point,
// will be padded with 0 if not enough digits
'integerDigits'=>1,
// the primary grouping size, 0 means no grouping
'groupSize1'=>3,
// the secondary grouping size, 0 means no secondary grouping
'groupSize2'=>0,
'positivePrefix'=>'+', // prefix to positive number
'positiveSuffix'=>'', // suffix to positive number
'negativePrefix'=>'(', // prefix to negative number
'negativeSuffix'=>')', // suffix to negative number
'multiplier'=>1, // 100 for percent, 1000 for per mille
);
|
$value | mixed | the number to be formatted |
{return} | string | the formatted result |
Source Code: framework/i18n/CNumberFormatter.php#165 (
show)
protected function formatNumber($format,$value)
{
$negative=$value<0;
$value=abs($value*$format['multiplier']);
if($format['maxDecimalDigits']>=0)
$value=number_format($value,$format['maxDecimalDigits'],'.','');
$value="$value";
if(false !== $pos=strpos($value,'.'))
{
$integer=substr($value,0,$pos);
$decimal=substr($value,$pos+1);
}
else
{
$integer=$value;
$decimal='';
}
if($format['decimalDigits']>strlen($decimal))
$decimal=str_pad($decimal,$format['decimalDigits'],'0');
elseif($format['decimalDigits']<strlen($decimal))
{
$decimal_temp='';
for($i=strlen($decimal)-1;$i>=0;$i--)
if($decimal[$i]!=='0' || strlen($decimal_temp)>0)
$decimal_temp=$decimal[$i].$decimal_temp;
$decimal=$decimal_temp;
}
if(strlen($decimal)>0)
$decimal=$this->_locale->getNumberSymbol('decimal').$decimal;
$integer=str_pad($integer,$format['integerDigits'],'0',STR_PAD_LEFT);
if($format['groupSize1']>0 && strlen($integer)>$format['groupSize1'])
{
$str1=substr($integer,0,-$format['groupSize1']);
$str2=substr($integer,-$format['groupSize1']);
$size=$format['groupSize2']>0?$format['groupSize2']:$format['groupSize1'];
$str1=str_pad($str1,(int)((strlen($str1)+$size-1)/$size)*$size,' ',STR_PAD_LEFT);
$integer=ltrim(implode($this->_locale->getNumberSymbol('group'),str_split($str1,$size))).$this->_locale->getNumberSymbol('group').$str2;
}
if($negative)
$number=$format['negativePrefix'].$integer.$decimal.$format['negativeSuffix'];
else
$number=$format['positivePrefix'].$integer.$decimal.$format['positiveSuffix'];
return strtr($number,array('%'=>$this->_locale->getNumberSymbol('percentSign'),'‰'=>$this->_locale->getNumberSymbol('perMille')));
}
Formats a number based on a format. This is the method that does actual number formatting.
public string formatPercentage(mixed $value) |
$value | mixed | the number to be formatted |
{return} | string | the formatting result. |
Formats a number using the percentage format defined in the locale. Note, if the percentage format contains '%', the number will be multiplied by 100 first. If the percentage format contains '‰', the number will be multiplied by 1000.
protected array parseFormat(string $pattern) |
$pattern | string | the pattern to be parsed |
{return} | array | the parsed pattern |
Source Code: framework/i18n/CNumberFormatter.php#219 (
show)
protected function parseFormat($pattern)
{
if(isset($this->_formats[$pattern]))
return $this->_formats[$pattern];
$format=array();
// find out prefix and suffix for positive and negative patterns
$patterns=explode(';',$pattern);
$format['positivePrefix']=$format['positiveSuffix']=$format['negativePrefix']=$format['negativeSuffix']='';
if(preg_match('/^(.*?)[#,\.0]+(.*?)$/',$patterns[0],$matches))
{
$format['positivePrefix']=$matches[1];
$format['positiveSuffix']=$matches[2];
}
if(isset($patterns[1]) && preg_match('/^(.*?)[#,\.0]+(.*?)$/',$patterns[1],$matches)) // with a negative pattern
{
$format['negativePrefix']=$matches[1];
$format['negativeSuffix']=$matches[2];
}
else
{
$format['negativePrefix']=$this->_locale->getNumberSymbol('minusSign').$format['positivePrefix'];
$format['negativeSuffix']=$format['positiveSuffix'];
}
$pat=$patterns[0];
// find out multiplier
if(strpos($pat,'%')!==false)
$format['multiplier']=100;
elseif(strpos($pat,'‰')!==false)
$format['multiplier']=1000;
else
$format['multiplier']=1;
// find out things about decimal part
if(($pos=strpos($pat,'.'))!==false)
{
if(($pos2=strrpos($pat,'0'))>$pos)
$format['decimalDigits']=$pos2-$pos;
else
$format['decimalDigits']=0;
if(($pos3=strrpos($pat,'#'))>=$pos2)
$format['maxDecimalDigits']=$pos3-$pos;
else
$format['maxDecimalDigits']=$format['decimalDigits'];
$pat=substr($pat,0,$pos);
}
else // no decimal part
{
$format['decimalDigits']=0;
$format['maxDecimalDigits']=0;
}
// find out things about integer part
$p=str_replace(',','',$pat);
if(($pos=strpos($p,'0'))!==false)
$format['integerDigits']=strrpos($p,'0')-$pos+1;
else
$format['integerDigits']=0;
// find out group sizes. some patterns may have two different group sizes
$p=str_replace('#','0',$pat);
if(($pos=strrpos($pat,','))!==false)
{
$format['groupSize1']=strrpos($p,'0')-$pos;
if(($pos2=strrpos(substr($p,0,$pos),','))!==false)
$format['groupSize2']=$pos-$pos2-1;
else
$format['groupSize2']=0;
}
else
$format['groupSize1']=$format['groupSize2']=0;
return $this->_formats[$pattern]=$format;
}
Parses a given string pattern.