URL encode/decode

<pre>
<FORM method='POST'>
 <label><b>URL encode:</b></label>
 <input type='text' name='url'><input type='submit' name='submit' value='Encode'>

 <label><b>URL decode:</b></label>
 <input type='text' name='url2'><input type='submit' name='submit2' value='Decode'>
</FORM>
</pre>

<?php
IF (isset($_POST['submit'])) {
  $url = $_POST['url'];
  $encode = urlencode($url);
  echo "Encode: ".$encode;
}
IF (isset($_POST['submit2'])) {
  $url2 = $_POST['url2'];
  $decode = urldecode($url2);
  echo "Decode: ".$decode;
}
?>