Base64 encode/decode

<pre>
 <FORM method='POST'>
 <label><b>Base64 encode/decode:</b></label>
 <textarea name='base64' rows='5' cols='71'></textarea><br>
 <input type='submit' name='submit' value='Encode'>
 <input type='submit' name='submit2' value='Decode'>
</pre>

<?php
IF (isset($_POST['submit'])) {
  $base64 = $_POST['base64'];
  $encode = base64_encode($base64);
  echo "Encode: ".$encode;
}
IF (isset($_POST['submit2'])) {
  $base64 = $_POST['base64'];
  $decode = base64_decode($base64);
  echo "Decode: ".$decode;
}
?>