<form action="valuta2.php" method="get">

Danske kroner: <input type="text" value="<?php @echo $_GET["input1"]; ?>" name="input1" />

<select name= "valuta1">
  <option value="0">Til Danske Kroner</option>
  <option value="1">Til Svenske Kroner</option>
  <option value="2">Til Norske Kroner</option>
  <option value="3">Til Euro</option>
  <option value="4">Til Amerikanske Dollars</option>
  <option value="5">Til Britiske Pund</option>
</select>

<br  />

<input type="submit" value="Konverter" />

</form>


<?php

// make sure they entered a number
if (!is_numeric($_GET["input1"])) {
   die("Indsæt venligst kun tal");
}

$kurs = array (1.00, 0.82 , 0.96 , 7.44 , 5.4, 11);
$outputName = array ('Danske Kroner', 'Svenske Kroner', 'Norske Kroner', 'Euro', 'Amerikanske Dollars', 'Britiske Pund');

$convertFrom = intval($_GET["input1"]);
$convertTo = intval($_GET["valuta1"]);

$convertToRatio = $kurs[$convertTo];

$outputValue = $convertFrom / $convertToRatio;

echo "$convertFrom Danske Kroner = $outputValue " . $outputName[$convertTo];


?>