=====Unit Converter=====
(GmBowen:) Mark & I modified another script so that it could be an action that could do unit conversions. (doesn't do gallons yet....maybe I'll add that later). 

Save the following code as ##actions/unitconverter.php## and call it with ""{{unitconverter}}"".

%%(php)
<! -- based on Convert v 1.1 copyright by Bill Pellowe who wrote "You can do what you want with this" @ the download site-->
<!-- Notes on error checking: Distinguishes singular and plural in the first value. Reloads if no values are given. Tidied up, faster than 1.0 -->
<!-- Modified from original program to work in Wakka Wiki (and related wiki's) by Mark Kasper & G. Michael Bowen for a research program funded by SSHRC. -->
<!-- Changes to original code copyright Kasper & Bowen, 2004...but released to public domain -->

<?php
// array of key (what to convert) and value (description of it)
$convert_array[celfar] = "degrees Celsius to Fahrenheit";
$convert_array[farcel] = "degrees Fahrenheit to Celsius";
$convert_array[cmin] = "centimeters to inches";
$convert_array[incm] = "inches to centimeters";
$convert_array[mefe] = "meters to feet";
$convert_array[feme] = "feet to meters";
$convert_array[kmmi] = "kilometers to miles";
$convert_array[mikm] = "miles to kilometers";
$convert_array[kglb] = "kilograms to pounds";
$convert_array[lbkg] = "pounds to kilograms";
$convert_array[mloz] = "milliliters to ounces";
$convert_array[ozml] = "ounces to milliliters";
$convert_array[rbtb] = "regular beers to tall beers";
$convert_array[tbrb] = "tall beers to regular beers";

$value1 = $_POST[value1];
$convert = $_POST[convert];
 
$form_block = "
<form method  = \"post\" action = \"$PHP_SELF\">
<p>Enter a number:&nbsp;&nbsp;<input type = \"text\" name=\"value1\"  size=10></p>
<p>Change that number from...<br>
<select name =\"convert\">";
 
if(!($convert)) {
  $con_sel = "celfar";
  }
  else{
  $con_sel = $convert;
  }
// build the menu
foreach($convert_array as $key=>$desc)
{
  if($key=="$con_sel") {
  $selected = " selected";
  }
  else{
  $selected = "";
  }
$form_block .= "<option value=\""
			. $key
			. "\""
			. $selected
			. ">$desc</option>";
} // end of for each
 
$form_block .= "</select></p>
<p><input type=\"submit\" name=\"submit\" value=\"Do the conversion\"></p>
</form>
<p>&nbsp;</p>
<p>&nbsp;<font size=\"-2\" face=\"verdana, sans-serif\">&copy; 2002 by Bill Pellowe</a></font></p>
";
 
// remove commas and spaces
trim($value1);
$valuetemp = str_replace(",", "", $value1);
$value = str_replace(" ", "", $valuetemp);
if(!(is_numeric($value)))
{
  $value="";
  $msg_warn = "<h2>Type a number, no letters.</h2>";
}
 
// get the first character in the value to  later check  that it's not a letter
$check = substr($value, 0, 1);
 
// in case no number is entered, the page refreshes
if ($value  == "") {
//        echo "<p><h1>Conversion Tool<img border=\"0\" src=\"../images/php-small-white.gif\" align=\"texttop\" hspace=\"30\" width=\"88\" height=\"31\" alt=\"PHP\"></h1></p>";
		echo $msg_warn;
		echo "<ul>This does a variety of conversions, such as centimeters to inches as so on.<br>";
		echo "First, put a number in the box, then choose a calculation, then press the button at the bottom.<br>";
		echo "Use a period . for decimal points.</ul>";
		echo "<hr>";
		echo "$form_block";
 
} else if (($check != "0") && ($check != "1") && ($check != "2") && ($check != "3")  && ($check != "4") && ($check != "5") && ($check != "6") && ($check != "7") && ($check != "8") && ($check != "9") && ($check != ".") && ($check != "-")) {
// oddly the quotes were needed above around 0 etc for absolute values otherwise letters parsed through
		echo "<h1>Conversion Tool</h1></p>";
		echo "<ul>This does a variety of conversions, such as centimeters to inches as so on.<br>";
		echo "First, put a number in the box, then choose a calculation, then press the button at the bottom.<br>";
		echo "Use a period . for decimal points. <strong>It can't start with a letter.</strong></ul>";
		echo "<hr>";
		echo "$form_block";
 
} else {
		{
				if ($value == 1) {
						$plural = "";
						} else
				$plural = "s";
		 }
 
   switch($convert)
   {
   case "celfar":
		$result = ($value*1.8) +32;
		$unit1 = "degree";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;celsius (C)";
		$unit2 = "degrees fahrenheit (F)";
   break;
   case "farcel":
		$result = ($value - 32) * 0.5556;
		$unit1 = "degree";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;fahrenheit (F)";
		$unit2 = "degrees celsius (C)";
   break;
   case "cmin":
		$result = $value * 0.393701;
		$unit1 = "centimeter";
		$unit1 .= $plural;
		$unit2 = "inches";
   break;
   case "incm":
		$result = $value * 2.54;
		$unit1 = "inch";
		if ($plural == "s") {
				$plural = "es";
				}
		$unit1 .= $plural;
		$unit2 = "centimeters";
   break;
   case "mefe":
		$result = $value * 3.28084;
		$unit1 = "meter";
		$unit1 .= $plural;
		$unit2 = "feet";
   break;
   case "feme":
		$result = $value * 0.3048;
		if ($plural != "s") {
				$unit1 = "foot";
				} else {
				$unit1 = "feet";
				}
		$unit2 = "meters";
   break;
   case "kmmi":
		$result = $value * 0.621371;
		$unit1 = "kilometer";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;(km)";
		$unit2 = "miles (mi)";
  break;
  case "mikm":
		$result = $value * 1.60934;
		$unit1 = "mile";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;(mi)";
		$unit2 = "kilometers (km)";
  break;
  case "kglb":
		$result = $value * 2.20462;
		$unit1 = "kilogram";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;(kg)";
		$unit2 = "pounds (lb)";
  break;
  case "lbkg":
		$result = $value * 0.453592;
		$unit1 = "pound";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;(lb)";
		$unit2 = "kilograms (kg)";
  break;
  case "mloz":
		$result = $value * 0.0338146;
		$resultUK = $value * 0.035195083;
		$unit1 = "milliliter";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;(ml)";
		$unit2 = "U.S. ounces (oz), or&nbsp;";
		$unit2 .= number_format($resultUK, "3", ".", ",");
		$unit2 .= "&nbsp;ounces in British measurement. <br><i>(1 US oz is 1.0408 UK oz)</i>";
  break;
  case "ozml":
		$result = $value * 29.57303;
		$resultUK = $value * 28.41306;
		$unit1 = "ounce";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;(oz)";
		$unit2 = "milliliters, but only if you're using US ounces. <br>If you're using British ounces, the answer is&nbsp;";
		$unit2 .= number_format($resultUK, "2", ".", ",");
		$unit2 .= "&nbsp;milliliters (because one US oz is 1.0408 UK oz)";
  break;
  case "rbtb":
		$result = $value * 0.75;
		$unit1 = "regular-size can";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;(350 ml, or 12 oz) of beer";
		$unit2 = "tall cans (500 ml, or 16 oz) of beer.<br>(It doesn't matter if you have ml or oz beers; the difference in the ratio between ml and oz beers is only 0.000005 cans of beer.)";
  break;
  case "tbrb":
		$result = $value * 1.33;
		$unit1 = "tall can";
		$unit1 .= $plural;
		$unit1 .= "&nbsp;(500 ml, or 16 oz) of beer";
		$unit2 = "regular cans (350 ml, or 12 oz) of beer.<br>(It doesn't matter if you have ml or oz beers; the difference in the ratio between ml and oz beers is only 0.000005 cans of beer.)";
  break;
}
 
echo "<h1>Conversion Tool<a href=\"http://www.php.net\">$php_link</a></p></h1>";
echo "<strong>Result of your conversion:</strong></p>";
echo "<ul><strong>$value</strong> $unit1 is equal to <strong>";
// format the result (number value, decimal places, decimal separator, thousands separator)
echo number_format($result, "2", ".", ",");
echo "</strong> $unit2.</ul>";
echo "<hr>";
echo "<p>You can do another conversion if you'd like:</p>";
echo "$form_block";
}
?>
%%

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