Mileage Conversion Script -- code.

See it work here. Copy and use if you want. Leave a link to PHP Stuff, please, if you use this in whole or in part. Written in PHP.

<html>

<head>

<title>Mileage Converter</title>

<META Name="description" Content="Converts mpg (US miles per gallon) to liters per kilometer, and vice versa">

<META Name="keywords" Content="convert, converstion, miles, kilograms, mpg, kpl">

</head>

<body bgcolor=white>

<! -- Mileage v 1.0, Bill Pellowe, bill@eltcalendar.com -->

<?

$form_block = "

<form method  = \"post\" action = \"$PHP_SELF\">

<p>Put a number here:&nbsp;&nbsp;<input type = \"text\" name=\"value1\"  size=10></p>

<p>Change that number...<br>

<select name =\"convert\">

        <option value=\"mpgkpl\" selected>from miles per gallon to kilometers per liter</option>

        <option value=\"kplmpg\">from kilometers per liter to miles per gallon</option>

</select></p>

<p><input type=\"submit\" name=\"submit\" value=\"Do the conversion\"></p>

</form>

<p>&nbsp;</p>

<p>&nbsp;<font size=\"-2\"><a href=\"index.php\">up</a></p>

";

// remove commas and spaces

trim($value1);

$valuetemp = str_replace(",", "", $value1);

$value = str_replace(" ", "", $valuetemp);

// 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 "<h1>Mileage Conversion Tool<img border=\"0\" src=\"../images/php-small-white.gif\" align=\"texttop\" hspace=\"30\" width=\"88\" height=\"31\" alt=\"PHP\"></p></h1>";

        echo "<ul>Jack said this would be useful.</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 != "-")) 
  {

        echo "<h1>Mileage Conversion Tool<img border=\"0\" src=\"../images/php-small-white.gif\" align=\"texttop\" hspace=\"30\" width=\"88\" height=\"31\" alt=\"PHP\"></p></h1>";

        echo "<ul>Jack said this would be useful. <strong>It can't start with a letter.</strong></ul>";

        echo "<hr>";

        echo "$form_block";

} else {

                if ($value == 1) {

                        $plural = "";

                        } else

                $plural = "s";

        if ($convert == "mpgkpl") {

        $result = ($value * 1.6093) / 3.79;

        $unit1 = "mile";

        $unit1 .= $plural;

        $unit1 .= "&nbsp;per gallon (US)";

        $unit2 = "kilometers per liter";

        } else if ($convert == "kplmpg") {

        $result = ($value * 0.6214) / 0.26;

        $unit1 = "kilometer";

        $unit1 .= $plural;

        $unit1 .= "&nbsp;per liter";

        $unit2 = "miles per gallon (US)";

echo "<h1>Mileage Conversion Tool<img border=\"0\" src=\"../images/php-small-white.gif\" align=\"texttop\" hspace=\"30\" width=\"88\" height=\"31\" alt=\"PHP\"></p></h1>";

echo "<p><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.";

if ($check == "-") {

        echo "<br><font color=red><i>What are you doing, driving backwards?</i></font>";

echo "</ul></p><hr>";

echo "<p>You can do another conversion if you'd like:</p>";

echo "$form_block";

?>

</body>

</html>