<?
$num_in = $_REQUEST[num_in];
$units_in = $_REQUEST[units_in];
$units_out = $_REQUEST[units_out];
if ( ($units_in == $units_out) )
{ $constant = 1;}
if ( ($units_in == "Miles") && ( $units_out == "Kilometers") )
{ $constant = 1.609344;}
if ( ($units_in == "Miles") && ( $units_out == "Feet") )
{ $constant = 5280;}
if ( ($units_in == "Miles") && ( $units_out == Meters) )
{ $constant = 1609.344;}
if ( ($units_in == "Kilometers") && ( $units_out == "Miles") )
{ $constant = .621371;}
if ( ($units_in == "Kilometers") && ( $units_out == "Feet") )
{ $constant = 3280.83989;}
if ( ($units_in == "Kilometers") && ( $units_out == "Meters") )
{ $constant = 1000;}
if ( ($units_in == "Feet") && ( $units_out == "Miles") )
{ $constant = .000189394;}
if ( ($units_in == "Feet") && ( $units_out == "Kilometers") )
{ $constant = .0003048;}
if ( ($units_in == "Feet") && ( $units_out == "Meters") )
{ $constant = .3048;}
if ( ($units_in == "Meters") && ( $units_out == "Miles") )
{ $constant = .000621371;}
if ( ($units_in == "Meters") && ( $units_out == "Kilometers") )
{ $constant = .001;}
if ( ($units_in == "Meters") && ( $units_out == "Feet") )
{ $constant = 3.280839;}
$out = $num_in*$constant;
?>
<html><body bgcolor="#fad888">
<form>
<center>
<input type="text" cols="5" name="num_in" value="<? echo "$num_in"; ?>" />
<select name="units_in">
<option value="Miles"<?
if ( $units_in == "Miles" )
{ echo " selected"; } ?>>Miles</option>
<option value="Kilometers"<?
if ( $units_in == "Kilometers" )
{ echo " selected"; } ?>>Kilometers</option>
<option value="Feet"<?
if ( $units_in == "Feet" )
{ echo " selected"; } ?>>Feet</option>
<option value="Meters"<?
if ( $units_in == "Meters" )
{ echo " selected"; } ?>>Meters</option>
</select>
Convert To
<select name="units_out">
<option value="Miles"<?
if ( $units_out == "Miles" )
{ echo " selected"; } ?>>Miles</option>
<option value="Kilometers"<?
if ( $units_out == "Kilometers" )
{ echo " selected"; } ?>>Kilometers</option>
<option value="Feet"<?
if ( $units_out == "Feet" )
{ echo " selected"; } ?>>Feet</option>
<option value="Meters"<?
if ( $units_out == "Meters" )
{ echo " selected"; } ?>>Meters</option>
</select>
<input type="submit" /><br />
<?
if ( isset($num_in) )
{
echo "<input type=\"text\" cols=\"10\" name=\"num_out\" value=\"$out\" /><br />";
echo "$num_in $units_in = $out $units_out<br />"; }
?>
</center>
</form>
</body></html>