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<?php
/**
* Phergie
*
* PHP version 5
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.
* It is also available through the world-wide-web at this URL:
* http://phergie.org/license
*
* @category Phergie
* @package Phergie_Plugin_Temperature
* @author Phergie Development Team <team@phergie.org>
* @copyright 2008-2010 Phergie Development Team (http://phergie.org)
* @license http://phergie.org/license New BSD License
* @link http://pear.phergie.org/package/Phergie_Plugin_Temperature
*/
/**
* Performs temperature calculations for other plugins.
*
* @category Phergie
* @package Phergie_Plugin_Temperature
* @author Phergie Development Team <team@phergie.org>
* @license http://phergie.org/license New BSD License
* @link http://pear.phergie.org/package/Phergie_Plugin_Temperature
*/
class Phergie_Plugin_Temperature extends Phergie_Plugin_Abstract
{
/**
* Converts a temperature in Celsius to Fahrenheit.
*
* @param int $temp Temperature in Celsius
*
* @return int Temperature converted to Fahrenheit
*/
public function convertCelsiusToFahrenheit($temp)
{
return round(((((int) $temp * 9) / 5) + 32));
}
/**
* Converts a temperature in Fahrenheit to Celsius.
*
* @param int $temp Temperature in Fahrenheit
*
* @return int Temperature converted to Celsius
*/
public function convertFahrenheitToCelsius($temp)
{
return round(((((int) $temp - 32) * 5) / 9));
}
/**
* Calculates the heat index (i.e. "feels like" temperature) based on
* temperature and relative humidity.
*
* @param int $temperature Temperature in degrees Fahrenheit
* @param int $humidity Relative humidity (ex: 68)
* @return int Heat index in degrees Fahrenheit
*/
public function getHeatIndex($temperature, $humidity)
{
$temperature2 = $temperature * $temperature;
$humidity2 = $humidity * $humidity;
return round(
-42.379 +
(2.04901523 * $temperature) +
(10.14333127 * $humidity) -
(0.22475541 * $temperature * $humidity) -
(0.00683783 * $temperature2) -
(0.05481717 * $humidity2) +
(0.00122874 * $temperature2 * $humidity) +
(0.00085282 * $temperature * $humidity2) -
(0.00000199 * $temperature2 * $humidity2)
);
}
}
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