300 lines
9.3 KiB
PHP
300 lines
9.3 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Locale
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Math.php 14041 2009-02-10 21:49:38Z thomas $
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*/
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/**
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* Utility class for proxying math function to bcmath functions, if present,
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* otherwise to PHP builtin math operators, with limited detection of overflow conditions.
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* Sampling of PHP environments and platforms suggests that at least 80% to 90% support bcmath.
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* Thus, this file should be as light as possible.
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*
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* @category Zend
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* @package Zend_Locale
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Locale_Math
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{
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// support unit testing without using bcmath functions
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public static $_bcmathDisabled = false;
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public static $add = array('Zend_Locale_Math', 'Add');
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public static $sub = array('Zend_Locale_Math', 'Sub');
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public static $pow = array('Zend_Locale_Math', 'Pow');
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public static $mul = array('Zend_Locale_Math', 'Mul');
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public static $div = array('Zend_Locale_Math', 'Div');
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public static $comp = array('Zend_Locale_Math', 'Comp');
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public static $sqrt = array('Zend_Locale_Math', 'Sqrt');
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public static $mod = array('Zend_Locale_Math', 'Mod');
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public static $scale = 'bcscale';
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public static function isBcmathDisabled()
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{
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return self::$_bcmathDisabled;
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}
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/**
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* Surprisingly, the results of this implementation of round()
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* prove better than the native PHP round(). For example, try:
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* round(639.795, 2);
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* round(267.835, 2);
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* round(0.302515, 5);
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* round(0.36665, 4);
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* then try:
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* Zend_Locale_Math::round('639.795', 2);
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*/
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public static function round($op1, $precision = 0)
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{
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if (self::$_bcmathDisabled) {
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return self::normalize(round($op1, $precision));
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}
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$op1 = trim(self::normalize($op1));
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$length = strlen($op1);
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if (($decPos = strpos($op1, '.')) === false) {
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$op1 .= '.0';
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$decPos = $length;
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$length += 2;
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}
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if ($precision < 0 && abs($precision) > $decPos) {
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return '0';
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}
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$digitsBeforeDot = $length - ($decPos + 1);
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if ($precision >= ($length - ($decPos + 1))) {
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return $op1;
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}
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if ($precision === 0) {
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$triggerPos = 1;
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$roundPos = -1;
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} elseif ($precision > 0) {
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$triggerPos = $precision + 1;
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$roundPos = $precision;
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} else {
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$triggerPos = $precision;
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$roundPos = $precision -1;
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}
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$triggerDigit = $op1[$triggerPos + $decPos];
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if ($precision < 0) {
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// zero fill digits to the left of the decimal place
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$op1 = substr($op1, 0, $decPos + $precision) . str_pad('', abs($precision), '0');
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}
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if ($triggerDigit >= '5') {
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if ($roundPos + $decPos == -1) {
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return str_pad('1', $decPos + 1, '0');
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}
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$roundUp = str_pad('', $length, '0');
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$roundUp[$decPos] = '.';
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$roundUp[$roundPos + $decPos] = '1';
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return bcadd($op1, $roundUp, $precision);
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} elseif ($precision >= 0) {
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return substr($op1, 0, $decPos + ($precision ? $precision + 1: 0));
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}
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return (string) $op1;
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}
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/**
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* Normalizes an input to standard english notation
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* Fixes a problem of BCMath with setLocale which is PHP related
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*
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* @param integer $value Value to normalize
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* @return string Normalized string without BCMath problems
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*/
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public static function normalize($value)
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{
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$convert = localeconv();
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$value = str_replace($convert['thousands_sep'], "",(string) $value);
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$value = str_replace($convert['positive_sign'], "", $value);
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$value = str_replace($convert['decimal_point'], ".",$value);
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if (!empty($convert['negative_sign']) and (strpos($value, $convert['negative_sign']))) {
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$value = str_replace($convert['negative_sign'], "", $value);
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$value = "-" . $value;
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}
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return $value;
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}
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/**
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* Localizes an input from standard english notation
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* Fixes a problem of BCMath with setLocale which is PHP related
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*
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* @param integer $value Value to normalize
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* @return string Normalized string without BCMath problems
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*/
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public static function localize($value)
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{
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$convert = localeconv();
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$value = str_replace(".", $convert['decimal_point'], (string) $value);
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if (!empty($convert['negative_sign']) and (strpos($value, "-"))) {
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$value = str_replace("-", $convert['negative_sign'], $value);
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}
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return $value;
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}
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/**
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* Changes exponential numbers to plain string numbers
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* Fixes a problem of BCMath with numbers containing exponents
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*
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* @param integer $value Value to erase the exponent
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* @param integer $scale (Optional) Scale to use
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* @return string
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*/
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public static function exponent($value, $scale = null)
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{
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if (!extension_loaded('bcmath')) {
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return $value;
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}
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$split = explode('e', $value);
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if (count($split) == 1) {
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$split = explode('E', $value);
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}
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if (count($split) > 1) {
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$value = bcmul($split[0], bcpow(10, $split[1], $scale), $scale);
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}
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return $value;
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}
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/**
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* BCAdd - fixes a problem of BCMath and exponential numbers
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*
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* @param string $op1
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* @param string $op2
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* @param integer $scale
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* @return string
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*/
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public static function Add($op1, $op2, $scale = null)
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{
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$op1 = self::exponent($op1, $scale);
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$op2 = self::exponent($op2, $scale);
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return bcadd($op1, $op2, $scale);
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}
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/**
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* BCSub - fixes a problem of BCMath and exponential numbers
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*
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* @param string $op1
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* @param string $op2
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* @param integer $scale
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* @return string
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*/
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public static function Sub($op1, $op2, $scale = null)
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{
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$op1 = self::exponent($op1, $scale);
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$op2 = self::exponent($op2, $scale);
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return bcsub($op1, $op2, $scale);
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}
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/**
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* BCPow - fixes a problem of BCMath and exponential numbers
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*
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* @param string $op1
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* @param string $op2
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* @param integer $scale
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* @return string
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*/
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public static function Pow($op1, $op2, $scale = null)
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{
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$op1 = self::exponent($op1, $scale);
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$op2 = self::exponent($op2, $scale);
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return bcpow($op1, $op2, $scale);
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}
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/**
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* BCMul - fixes a problem of BCMath and exponential numbers
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*
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* @param string $op1
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* @param string $op2
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* @param integer $scale
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* @return string
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*/
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public static function Mul($op1, $op2, $scale = null)
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{
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$op1 = self::exponent($op1, $scale);
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$op2 = self::exponent($op2, $scale);
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return bcmul($op1, $op2, $scale);
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}
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/**
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* BCDiv - fixes a problem of BCMath and exponential numbers
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*
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* @param string $op1
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* @param string $op2
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* @param integer $scale
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* @return string
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*/
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public static function Div($op1, $op2, $scale = null)
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{
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$op1 = self::exponent($op1, $scale);
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$op2 = self::exponent($op2, $scale);
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return bcdiv($op1, $op2, $scale);
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}
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/**
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* BCSqrt - fixes a problem of BCMath and exponential numbers
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*
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* @param string $op1
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* @param integer $scale
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* @return string
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*/
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public static function Sqrt($op1, $scale = null)
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{
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$op1 = self::exponent($op1, $scale);
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return bcsqrt($op1, $scale);
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}
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/**
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* BCMod - fixes a problem of BCMath and exponential numbers
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*
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* @param string $op1
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* @param string $op2
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* @return string
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*/
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public static function Mod($op1, $op2)
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{
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$op1 = self::exponent($op1);
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$op2 = self::exponent($op2);
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return bcmod($op1, $op2);
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}
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/**
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* BCComp - fixes a problem of BCMath and exponential numbers
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*
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* @param string $op1
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* @param string $op2
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* @param integer $scale
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* @return string
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*/
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public static function Comp($op1, $op2, $scale = null)
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{
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$op1 = self::exponent($op1, $scale);
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$op2 = self::exponent($op2, $scale);
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return bccomp($op1, $op2, $scale);
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}
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}
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if ((defined('TESTS_ZEND_LOCALE_BCMATH_ENABLED') && !TESTS_ZEND_LOCALE_BCMATH_ENABLED)
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|| !extension_loaded('bcmath')) {
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require_once 'Zend/Locale/Math/PhpMath.php';
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Zend_Locale_Math_PhpMath::disable();
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}
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