PHP Classes

PHP Order of Magnitude Prefix: Get the name of the prefix for a measure value

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Version License PHP version Categories
magnitudeprefix 1.0GNU Lesser Genera...5PHP 5, Conversion
Description 

Author

Alejandro Bazan

This class can get the name of the prefix for a measure value.

It takes as parameter the number of a measured value like for instance: seconds, meters, grams, etc..

The class returns string that can be used to represent the same number of the measure value using a prefix like Kilo, Mega, Giga, Tera, mili, micro, nano, pico, etc.. For example, "7000 meters" can be displayed as "7 Kilo meters".

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Name: Alejandro Bazan <contact>
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Example

<?php
require_once "magnitudePrefix.class.php";

$mp = new MagnitudePrefix();

//Some numbers
echo"<br>Some Numbers<br>";
$number = 0.2;
echo $number . " => " . $mp->getPrefixed($number, 'seconds') . "<BR/>";

$number = 0.002;
echo $number . " => " . $mp->getPrefixed($number, 'grams') . "<BR/>";

$number = 200;
echo $number . " => " . $mp->getPrefixed($number, 'Volts') . "<BR/>";

$number = 200000;
echo $number . " => " . $mp->getPrefixed($number, 'Ohms') . "<BR/>";

$number = 0.00002;
echo $number . " => " . $mp->getPrefixed($number, 'Farads') . "<BR/>";

//An expression, result from random calculation
echo"<br>An expression, result from random calculation<br>";
$number = round(rand() * exp(rand(-23,23)),2);
echo $number . " => " . $mp->getPrefixed($number, 'meters') . "<BR/>";

//Expand scale
echo"<br>Expand scale<br>";
$mp->setScaleToExpandedStandard();
$number = 0.25;
echo $number . " => " . $mp->getPrefixed($number, 'meters') . "<BR/>";

//Use Years
echo"<br>Use Years<br>";
$mp->setScaleToYears();
$number = 250;
echo $number . " => " . $mp->getPrefixed($number, '') . "<BR/>";

//Custom scale
echo"<br>Custom scale<br>";
$mp->setScaleToCustom(array(
            array('factor'=>1E-3, 'prefix'=>'mili'),
            array('factor'=>1E-2, 'prefix'=>'centi'),
            array('factor'=>1, 'prefix'=>''),
            array('factor'=>1E3, 'prefix'=>'Kilo')
        )
);
$number = 250;
echo $number . " => " . $mp->getPrefixed($number, 'meters') . "<BR/>";
$number = 0.43;
echo $number . " => " . $mp->getPrefixed($number, 'meters') . "<BR/>";
$number = 0.005;
echo $number . " => " . $mp->getPrefixed($number, 'meters') . "<BR/>";

?>

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Plain text file magnitudePrefix.class.php Class The magnitudePrefix class

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