friendica-addons/convert/convert.php

<?php
/**
 * Name: Converter App
 * Description: Unit converter application
 * Version: 1.0
 * Author: Mike Macgirvin <http://macgirvin.com/profile/mike>
 */
use Friendica\Core\Hook;

function convert_install() {
	Hook::register('app_menu', 'addon/convert/convert.php', 'convert_app_menu');
}

function convert_app_menu($a,&$b) {
	$b['app_menu'][] = '<div class="app-title"><a href="convert">Units Conversion</a></div>';
}


function convert_module() {}

function convert_content($app) {

include 'UnitConvertor.php';

 class TP_Converter extends UnitConvertor {
	function TP_Converter($lang = 'en')
	{
		if ($lang != 'en' ) {
			$dec_point = '.'; $thousand_sep = "'";
		} else {
			$dec_point = '.'; $thousand_sep = ',';
		}

		$this->UnitConvertor($dec_point , $thousand_sep );

	} // end func UnitConvertor

	function find_base_unit($from,$to) {
		while (list($skey,$sval) = each($this->bases)) {
				if ($skey == $from || $to == $skey || in_array($to,$sval) || in_array($from,$sval)) {
					return $skey;
				}
		}
		return false;
	}

	function getTable($value, $from_unit, $to_unit, $precision) {

		if ($base_unit = $this->find_base_unit($from_unit,$to_unit)) {

			// A baseunit was found now lets convert from -> $base_unit

				$cell ['value'] = $this->convert($value, $from_unit, $base_unit, $precision) . ' ' . $base_unit;
				$cell ['class']	= ($base_unit == $from_unit || $base_unit == $to_unit) ? 'framedred' : '';
				$cells[] = $cell;
			// We now have the base unit and value now lets produce the table;
			while (list($key,$val) = each($this->bases[$base_unit])) {
				$cell ['value'] = $this->convert($value, $from_unit, $val, $precision) . ' ' . $val;
				$cell ['class']	= ($val == $from_unit || $val == $to_unit) ? 'framedred' : '';
				$cells[] = $cell;
			}

			$cc = count($cells);
			$string = "<table class=\"framed grayish\" border=\"1\" cellpadding=\"5\" width=\"80%\" align=\"center\"><tr>";
			$string .= "<td rowspan=\"$cc\" align=\"center\">$value $from_unit</td>";
			$i=0;
			foreach ($cells as $cell) {
				if ($i==0) {
					$string .= "<td class=\"".$cell['class']."\">".$cell['value']."</td>";
					$i++;
				} else {
					$string .= "</tr><tr><td class=\"".$cell['class']."\">".$cell['value']."</td>";
				}
			}
			$string .= "</tr></table>";
			return $string;
		}

	}
}

$conv = new TP_Converter('en');

$conversions = [
	'Temperature' => ['base'  => 'Celsius',
		'conv' => [
			'Fahrenheit' => ['ratio' => 1.8, 'offset' => 32],
			'Kelvin' => ['ratio' => 1, 'offset' => 273],
			'Reaumur' => 0.8
		]
	],
	'Weight'  =>  ['base'  => 'kg',
		'conv' => [
			'g' => 1000,
			'mg' => 1000000,
			't' => 0.001,
			'grain' => 15432,
			'oz' => 35.274,
			'lb' => 2.2046,
			'cwt(UK)'	 =>  0.019684,
			'cwt(US)'	 =>  0.022046,
			'ton (US)'	 =>  0.0011023,
			'ton (UK)'	 =>  0.0009842
		]
	],
	'Distance'  =>  ['base'  => 'km',
		'conv' => [
			'm' => 1000,
			'dm' => 10000,
			'cm' => 100000,
			'mm' => 1000000,
	 		'mile' => 0.62137,
			'naut.mile' => 0.53996,
	 		'inch(es)' => 39370,
			'ft' => 3280.8,
			'yd' => 1093.6,
			'furlong' => 4.970969537898672,
			'fathom' => 546.8066491688539
		]
	],
	'Area'  =>  ['base'  => 'km 2',
		'conv' => [
			'ha' => 100,
			'acre' => 247.105,
			'm 2' => pow(1000,2),
			'dm 2' => pow(10000,2),
			'cm 2' => pow(100000,2),
			'mm 2' => pow(1000000,2),
			'mile 2' => pow(0.62137,2),
			'naut.miles 2' => pow(0.53996,2),
	 		'in 2' => pow(39370,2),
			'ft 2' => pow(3280.8,2),
			'yd 2' => pow(1093.6,2),
		]
	],
	'Volume'  =>  ['base'  => 'm 3',
		'conv' => [
			'in 3' => 61023.6,
			'ft 3' => 35.315,
			'cm 3' => pow(10,6),
	 		'dm 3' => 1000,
			'litre' => 1000,
			'hl' => 10,
			'yd 3' => 1.30795,
	 		'gal(US)' => 264.172,
			'gal(UK)' => 219.969,
			'pint'  =>  2113.376,
			'quart'  =>  1056.688,
			'cup'  =>  4266.753,
			'fl oz'  =>  33814.02,
			'tablespoon'  =>  67628.04,
			'teaspoon'  =>  202884.1,
			'pt (UK)' => 1000/0.56826,
			'barrel petroleum' => 1000/158.99,
			'Register Tons' => 2.832,
			'Ocean Tons' => 1.1327
		]
	],
	'Speed'	 => ['base'  => 'kmph',
		'conv' => [
			'mps' => 0.0001726031,
			'milesph' => 0.62137,
			'knots' => 0.53996,
			'mach STP' => 0.0008380431,
			'c (warp)' => 9.265669e-10
		]
	]
];


while (list($key,$val) = each($conversions)) {
	$conv->addConversion($val['base'], $val['conv']);
	$list[$key][] = $val['base'];
	while (list($ukey,$uval) = each($val['conv'])) {
		$list[$key][] = $ukey;
	}
}

  $o .= '<h3>Unit Conversions</h3>';


	if (isset($_POST['from_unit']) && isset($_POST['value'])) {
		$_POST['value'] = $_POST['value'] + 0;
		$o .= ($conv->getTable($_POST['value'], $_POST['from_unit'], $_POST['to_unit'], 5)) . '</p>';
	} else {
		$o .= '<p>Select:</p>';
	}

	if (isset($_POST['value'])) {
		$value = $_POST['value'];
	} else {
		$value = '';
	}

	$o .= '<form action="convert" method="post" name="conversion">';
	$o .= '<input name="value" type="text" id="value" value="' . $value . '" size="10" maxlength="10" />';
	$o .= '<select name="from_unit" size="12">';

	reset($list);
	while(list($key,$val) = each($list)) {
		$o .=  "\n\t<optgroup label=\"$key\">";
		while(list($ukey,$uval) = each($val)) {
			$selected = (($uval == $_POST['from_unit']) ? ' selected="selected" ' : '');
			$o .=  "\n\t\t<option value=\"$uval\" $selected >$uval</option>";
		}
		$o .= "\n\t</optgroup>";
	}

	$o .= '</select>';
	$o .= '<input type="submit" name="Submit" value="Submit" /></form>';

	return $o;
}