Frequency.php

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<?php
#require_once 'Zend/Measure/Abstract.php';
#require_once 'Zend/Locale.php';

class Zend_Measure_Frequency extends Zend_Measure_Abstract
{
    const STANDARD = 'HERTZ';

    const ONE_PER_SECOND        = 'ONE_PER_SECOND';
    const CYCLE_PER_SECOND      = 'CYCLE_PER_SECOND';
    const DEGREE_PER_HOUR       = 'DEGREE_PER_HOUR';
    const DEGREE_PER_MINUTE     = 'DEGREE_PER_MINUTE';
    const DEGREE_PER_SECOND     = 'DEGREE_PER_SECOND';
    const GIGAHERTZ             = 'GIGAHERTZ';
    const HERTZ                 = 'HERTZ';
    const KILOHERTZ             = 'KILOHERTZ';
    const MEGAHERTZ             = 'MEGAHERTZ';
    const MILLIHERTZ            = 'MILLIHERTZ';
    const RADIAN_PER_HOUR       = 'RADIAN_PER_HOUR';
    const RADIAN_PER_MINUTE     = 'RADIAN_PER_MINUTE';
    const RADIAN_PER_SECOND     = 'RADIAN_PER_SECOND';
    const REVOLUTION_PER_HOUR   = 'REVOLUTION_PER_HOUR';
    const REVOLUTION_PER_MINUTE = 'REVOLUTION_PER_MINUTE';
    const REVOLUTION_PER_SECOND = 'REVOLUTION_PER_SECOND';
    const RPM                   = 'RPM';
    const TERRAHERTZ            = 'TERRAHERTZ';

    protected $_units = array(
        'ONE_PER_SECOND'        => array('1',             '1/s'),
        'CYCLE_PER_SECOND'      => array('1',             'cps'),
        'DEGREE_PER_HOUR'       => array(array('' => '1', '/' => '1296000'), '°/h'),
        'DEGREE_PER_MINUTE'     => array(array('' => '1', '/' => '21600'),   '°/m'),
        'DEGREE_PER_SECOND'     => array(array('' => '1', '/' => '360'),     '°/s'),
        'GIGAHERTZ'             => array('1000000000',    'GHz'),
        'HERTZ'                 => array('1',             'Hz'),
        'KILOHERTZ'             => array('1000',          'kHz'),
        'MEGAHERTZ'             => array('1000000',       'MHz'),
        'MILLIHERTZ'            => array('0.001',         'mHz'),
        'RADIAN_PER_HOUR'       => array(array('' => '1', '/' => '22619.467'), 'rad/h'),
        'RADIAN_PER_MINUTE'     => array(array('' => '1', '/' => '376.99112'), 'rad/m'),
        'RADIAN_PER_SECOND'     => array(array('' => '1', '/' => '6.2831853'), 'rad/s'),
        'REVOLUTION_PER_HOUR'   => array(array('' => '1', '/' => '3600'), 'rph'),
        'REVOLUTION_PER_MINUTE' => array(array('' => '1', '/' => '60'),   'rpm'),
        'REVOLUTION_PER_SECOND' => array('1',             'rps'),
        'RPM'                   => array(array('' => '1', '/' => '60'), 'rpm'),
        'TERRAHERTZ'            => array('1000000000000', 'THz'),
        'STANDARD'              =>'HERTZ'
    );
}