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-<?php
-// +----------------------------------------------------------------------+
-// | PHP version 4.0 |
-// +----------------------------------------------------------------------+
-// | Copyright (c) 1997, 1998, 1999, 2000, 2001 The PHP Group |
-// +----------------------------------------------------------------------+
-// | This source file is subject to version 2.0 of the PHP license, |
-// | that is bundled with this package in the file LICENSE, and is |
-// | available at through the world-wide-web at |
-// | http://www.php.net/license/2_02.txt. |
-// | If you did not receive a copy of the PHP license and are unable to |
-// | obtain it through the world-wide-web, please send a note to |
-// | license@php.net so we can mail you a copy immediately. |
-// +----------------------------------------------------------------------+
-// | Authors: Stanislav Okhvat <stanis@ngs.ru> |
-// | Co-authored by : CVH, Chris Hansel <chris@cpi-service.com> |
-// +----------------------------------------------------------------------+
-//
-// $Id: UnitConvertor.php,v 1.00 2002/02/20 11:40:00 stasokhvat Exp $
-
-/**
-* UnitConvertor is able to convert between different units and currencies.
-*
-* @author Stanislav Okhvat <stanis@sibfair.nsk.su, stanis@ngs.ru>
-* @version $Id: UnitConvertor.php,v 1.00 2002/03/01 17:00:00 stasokhvat Exp $
-* @package UnitConvertor
-* @access public
-* @history 01.03.2002 Implemented the code for regular and offset-based
-* conversions
-*
-* 13.12.2004
-* By Chris Hansel (CVH): changed getConvSpecs in order to have it look up
-* intermediary conversions (also see comments in check_key).
-*
-* Intermediary conversions are useful when no conversion ratio is specified
-* between two units when we calculate between the two. For example, we want
-* to convert between Fahrenheit and Kelvin, and we have only
-* specified how to convert Centigrade<->Fahrenheit and
-* Centigrade<->Kelvin. While a direct (Fahrenheit->Kelvin) or
-* reverse (Kelvin->Fahrenheit) lookups fail, looking for an intermediary
-* unit linking the two (Centigrade) helps us do the conversion.
-*
-* 13.12.2004
-* Chris Hansel (CVH): $to_array argument of addConversion method can now
-* contain units as 'unit1/unit2/unit3', when all units stand for the same
-* thing. See examples in unitconv.php
-*/
-class UnitConvertor
-{
- /**
- * Stores conversion ratios.
- *
- * @var array
- * @access private
- */
- var $conversion_table = array();
-
- /**
- * Decimal point character (default is "." - American - set in constructor).
- *
- * @var string
- * @access private
- */
- var $decimal_point;
-
- /**
- * Thousands separator (default is "," - American - set in constructor).
- *
- * @var string
- * @access private
- */
- var $thousand_separator;
-
- /**
- * For future use
- *
- * @var array
- * @access private
- */
- var $bases = array();
-
- /**
- * Constructor. Initializes the UnitConvertor object with the most important
- * properties.
- *
- * @param string decimal point character
- * @param string thousand separator character
- * @return void
- * @access public
- */
- function UnitConvertor($dec_point = '.', $thousand_sep = ',')
- {
- $this->decimal_point = $dec_point;
- $this->thousand_separator = $thousand_sep;
-
- } // end func UnitConvertor
-
- /**
- * Adds a conversion ratio to the conversion table.
- *
- * @param string the name of unit from which to convert
- * @param array array(
- * "pound"=>array("ratio"=>'', "offset"=>'')
- * )
- * "pound" - name of unit to set conversion ration to
- * "ratio" - 'double' conversion ratio which, when
- * multiplied by the number of $from_unit units produces
- * the result
- * "offset" - an offset from 0 which will be added to
- * the result when converting (needed for temperature
- * conversions and defaults to 0).
- * @return boolean true if successful, false otherwise
- * @access public
- */
- function addConversion($from_unit, $to_array)
- {
- if (!isset($this->conversion_table[$from_unit])) {
- while(list($key, $val) = each($to_array))
- {
- if (strstr($key, '/'))
- {
- $to_units = explode('/', $key);
- foreach ($to_units as $to_unit)
- {
- $this->bases[$from_unit][] = $to_unit;
-
- if (!is_array($val))
- {
- $this->conversion_table[$from_unit."_".$to_unit] = array("ratio"=>$val, "offset"=>0);
- }
- else
- {
- $this->conversion_table[$from_unit."_".$to_unit] =
- array(
- "ratio"=>$val['ratio'],
- "offset"=>(isset($val['offset']) ? $val['offset'] : 0)
- );
- }
- }
- }
- else
- {
- $this->bases[$from_unit][] = $key;
-
- if (!is_array($val))
- {
- $this->conversion_table[$from_unit."_".$key] = array("ratio"=>$val, "offset"=>0);
- }
- else
- {
- $this->conversion_table[$from_unit."_".$key] =
- array(
- "ratio"=>$val['ratio'],
- "offset"=>(isset($val['offset']) ? $val['offset'] : 0)
- );
- }
- }
- }
- return true;
- }
- return false;
-
- } // end func addConversion
-
- /**
- * Converts from one unit to another using specified precision.
- *
- * @param double value to convert
- * @param string name of the source unit from which to convert
- * @param string name of the target unit to which we are converting
- * @param integer double precision of the end result
- * @return void
- * @access public
- */
- function convert($value, $from_unit, $to_unit, $precision)
- {
- if ($this->getConvSpecs($from_unit, $to_unit, $value, $converted ))
- {
- return number_format($converted , (int)$precision, $this->decimal_point, $this->thousand_separator);
- } else {
- return false;
- }
- } // end func
-
- /**
- * CVH : changed this Function getConvSpecs in order to have it look up
- * intermediary Conversions from the
- * "base" unit being that one that has the highest hierarchical order in one
- * "logical" Conversion_Array
- * when taking $conv->addConversion('km',
- * array('meter'=>1000, 'dmeter'=>10000, 'centimeter'=>100000,
- * 'millimeter'=>1000000, 'mile'=>0.62137, 'naut.mile'=>0.53996,
- * 'inch(es)/zoll'=>39370, 'ft/foot/feet'=>3280.8, 'yd/yard'=>1093.6));
- * "km" would be the logical base unit for all units of dinstance, thus,
- * if the function fails to find a direct or reverse conversion in the table
- * it is only logical to suspect that if there is a chance
- * converting the value it only is via the "base" unit, and so
- * there is not even a need for a recursive search keeping the perfomance
- * acceptable and the ressource small...
- *
- * CVH check_key checks for a key in the Conversiontable and returns a value
- */
- function check_key( $key) {
- if ( array_key_exists ($key,$this->conversion_table)) {
- if (! empty($this->conversion_table[$key])) {
- return $this->conversion_table[$key];
- }
- }
- return false;
- }
-
- /**
- * Key function. Finds the conversion ratio and offset from one unit to another.
- *
- * @param string name of the source unit from which to convert
- * @param string name of the target unit to which we are converting
- * @param double conversion ratio found. Returned by reference.
- * @param double offset which needs to be added (or subtracted, if negative)
- * to the result to convert correctly.
- * For temperature or some scientific conversions,
- * i.e. Fahrenheit -> Celcius
- * @return boolean true if ratio and offset are found for the supplied
- * units, false otherwise
- * @access private
- */
- function getConvSpecs($from_unit, $to_unit, $value, &$converted)
- {
- $key = $from_unit."_".$to_unit;
- $revkey = $to_unit."_".$from_unit;
- $found = false;
- if ($ct_arr = $this->check_key($key)) {
- // Conversion Specs found directly
- $ratio = (double)$ct_arr['ratio'];
- $offset = $ct_arr['offset'];
- $converted = (double)(($value * $ratio)+ $offset);
-
- return true;
- } // not found in direct order, try reverse order
- elseif ($ct_arr = $this->check_key($revkey)) {
- $ratio = (double)(1/$ct_arr['ratio']);
- $offset = -$ct_arr['offset'];
- $converted = (double)(($value + $offset) * $ratio);
-
- return true;
- } // not found test for intermediary conversion
- else {
- // return ratio = 1 if keyparts match
- if ($key == $revkey) {
- $ratio = 1;
- $offset = 0;
- $converted = $value;
- return true;
- }
- // otherwise search intermediary
- reset($this->conversion_table);
- while (list($convk, $i1_value) = each($this->conversion_table)) {
- // split the key into parts
- $keyparts = preg_split("/_/",$convk);
- // return ratio = 1 if keyparts match
-
- // Now test if either part matches the from or to unit
- if ($keyparts[1] == $to_unit && ($i2_value = $this->check_key($keyparts[0]."_".$from_unit))) {
- // an intermediary $keyparts[0] was found
- // now let us put things together intermediary 1 and 2
- $converted = (double)(((($value - $i2_value['offset']) / $i2_value['ratio']) * $i1_value['ratio'])+ $i1_value['offset']);
-
- $found = true;
-
- } elseif ($keyparts[1] == $from_unit && ($i2_value = $this->check_key($keyparts[0]."_".$to_unit))) {
- // an intermediary $keyparts[0] was found
- // now let us put things together intermediary 2 and 1
- $converted = (double)(((($value - $i1_value['offset']) / $i1_value['ratio']) + $i2_value['offset']) * $i2_value['ratio']);
-
- $found = true;
- }
- }
- return $found;
- }
-
- } // end func getConvSpecs
-
-} // end class UnitConvertor
-?> \ No newline at end of file
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