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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Locale
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Math.php 16221 2009-06-21 19:49:59Z thomas $
*/
/**
* Utility class for proxying math function to bcmath functions, if present,
* otherwise to PHP builtin math operators, with limited detection of overflow conditions.
* Sampling of PHP environments and platforms suggests that at least 80% to 90% support bcmath.
* Thus, this file should be as light as possible.
*
* @category Zend
* @package Zend_Locale
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Locale_Math
{
// support unit testing without using bcmath functions
public static $_bcmathDisabled = false;
public static $add = array('Zend_Locale_Math', 'Add');
public static $sub = array('Zend_Locale_Math', 'Sub');
public static $pow = array('Zend_Locale_Math', 'Pow');
public static $mul = array('Zend_Locale_Math', 'Mul');
public static $div = array('Zend_Locale_Math', 'Div');
public static $comp = array('Zend_Locale_Math', 'Comp');
public static $sqrt = array('Zend_Locale_Math', 'Sqrt');
public static $mod = array('Zend_Locale_Math', 'Mod');
public static $scale = 'bcscale';
public static function isBcmathDisabled()
{
return self::$_bcmathDisabled;
}
/**
* Surprisingly, the results of this implementation of round()
* prove better than the native PHP round(). For example, try:
* round(639.795, 2);
* round(267.835, 2);
* round(0.302515, 5);
* round(0.36665, 4);
* then try:
* Zend_Locale_Math::round('639.795', 2);
*/
public static function round($op1, $precision = 0)
{
if (self::$_bcmathDisabled) {
return self::normalize(round($op1, $precision));
}
$op1 = trim(self::normalize($op1));
$length = strlen($op1);
if (($decPos = strpos($op1, '.')) === false) {
$op1 .= '.0';
$decPos = $length;
$length += 2;
}
if ($precision < 0 && abs($precision) > $decPos) {
return '0';
}
$digitsBeforeDot = $length - ($decPos + 1);
if ($precision >= ($length - ($decPos + 1))) {
return $op1;
}
if ($precision === 0) {
$triggerPos = 1;
$roundPos = -1;
} elseif ($precision > 0) {
$triggerPos = $precision + 1;
$roundPos = $precision;
} else {
$triggerPos = $precision;
$roundPos = $precision -1;
}
$triggerDigit = $op1[$triggerPos + $decPos];
if ($precision < 0) {
// zero fill digits to the left of the decimal place
$op1 = substr($op1, 0, $decPos + $precision) . str_pad('', abs($precision), '0');
}
if ($triggerDigit >= '5') {
if ($roundPos + $decPos == -1) {
return str_pad('1', $decPos + 1, '0');
}
$roundUp = str_pad('', $length, '0');
$roundUp[$decPos] = '.';
$roundUp[$roundPos + $decPos] = '1';
if ($op1 > 0) {
return self::Add($op1, $roundUp, $precision);
} else {
return self::Sub($op1, $roundUp, $precision);
}
} elseif ($precision >= 0) {
return substr($op1, 0, $decPos + ($precision ? $precision + 1: 0));
}
return (string) $op1;
}
/**
* Normalizes an input to standard english notation
* Fixes a problem of BCMath with setLocale which is PHP related
*
* @param integer $value Value to normalize
* @return string Normalized string without BCMath problems
*/
public static function normalize($value)
{
$convert = localeconv();
$value = str_replace($convert['thousands_sep'], "",(string) $value);
$value = str_replace($convert['positive_sign'], "", $value);
$value = str_replace($convert['decimal_point'], ".",$value);
if (!empty($convert['negative_sign']) and (strpos($value, $convert['negative_sign']))) {
$value = str_replace($convert['negative_sign'], "", $value);
$value = "-" . $value;
}
return $value;
}
/**
* Localizes an input from standard english notation
* Fixes a problem of BCMath with setLocale which is PHP related
*
* @param integer $value Value to normalize
* @return string Normalized string without BCMath problems
*/
public static function localize($value)
{
$convert = localeconv();
$value = str_replace(".", $convert['decimal_point'], (string) $value);
if (!empty($convert['negative_sign']) and (strpos($value, "-"))) {
$value = str_replace("-", $convert['negative_sign'], $value);
}
return $value;
}
/**
* Changes exponential numbers to plain string numbers
* Fixes a problem of BCMath with numbers containing exponents
*
* @param integer $value Value to erase the exponent
* @param integer $scale (Optional) Scale to use
* @return string
*/
public static function exponent($value, $scale = null)
{
if (!extension_loaded('bcmath')) {
return $value;
}
$split = explode('e', $value);
if (count($split) == 1) {
$split = explode('E', $value);
}
if (count($split) > 1) {
$value = bcmul($split[0], bcpow(10, $split[1], $scale), $scale);
}
return $value;
}
/**
* BCAdd - fixes a problem of BCMath and exponential numbers
*
* @param string $op1
* @param string $op2
* @param integer $scale
* @return string
*/
public static function Add($op1, $op2, $scale = null)
{
$op1 = self::exponent($op1, $scale);
$op2 = self::exponent($op2, $scale);
return bcadd($op1, $op2, $scale);
}
/**
* BCSub - fixes a problem of BCMath and exponential numbers
*
* @param string $op1
* @param string $op2
* @param integer $scale
* @return string
*/
public static function Sub($op1, $op2, $scale = null)
{
$op1 = self::exponent($op1, $scale);
$op2 = self::exponent($op2, $scale);
return bcsub($op1, $op2, $scale);
}
/**
* BCPow - fixes a problem of BCMath and exponential numbers
*
* @param string $op1
* @param string $op2
* @param integer $scale
* @return string
*/
public static function Pow($op1, $op2, $scale = null)
{
$op1 = self::exponent($op1, $scale);
$op2 = self::exponent($op2, $scale);
return bcpow($op1, $op2, $scale);
}
/**
* BCMul - fixes a problem of BCMath and exponential numbers
*
* @param string $op1
* @param string $op2
* @param integer $scale
* @return string
*/
public static function Mul($op1, $op2, $scale = null)
{
$op1 = self::exponent($op1, $scale);
$op2 = self::exponent($op2, $scale);
return bcmul($op1, $op2, $scale);
}
/**
* BCDiv - fixes a problem of BCMath and exponential numbers
*
* @param string $op1
* @param string $op2
* @param integer $scale
* @return string
*/
public static function Div($op1, $op2, $scale = null)
{
$op1 = self::exponent($op1, $scale);
$op2 = self::exponent($op2, $scale);
return bcdiv($op1, $op2, $scale);
}
/**
* BCSqrt - fixes a problem of BCMath and exponential numbers
*
* @param string $op1
* @param integer $scale
* @return string
*/
public static function Sqrt($op1, $scale = null)
{
$op1 = self::exponent($op1, $scale);
return bcsqrt($op1, $scale);
}
/**
* BCMod - fixes a problem of BCMath and exponential numbers
*
* @param string $op1
* @param string $op2
* @return string
*/
public static function Mod($op1, $op2)
{
$op1 = self::exponent($op1);
$op2 = self::exponent($op2);
return bcmod($op1, $op2);
}
/**
* BCComp - fixes a problem of BCMath and exponential numbers
*
* @param string $op1
* @param string $op2
* @param integer $scale
* @return string
*/
public static function Comp($op1, $op2, $scale = null)
{
$op1 = self::exponent($op1, $scale);
$op2 = self::exponent($op2, $scale);
return bccomp($op1, $op2, $scale);
}
}
if ((defined('TESTS_ZEND_LOCALE_BCMATH_ENABLED') && !TESTS_ZEND_LOCALE_BCMATH_ENABLED)
|| !extension_loaded('bcmath')) {
require_once 'Zend/Locale/Math/PhpMath.php';
Zend_Locale_Math_PhpMath::disable();
}
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