Edit: example

Editing: example_web.php

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<?php

header( 'Content-Type: text/html; charset=UTF-8' );

require 'Net/IDNA.php';

$idn = Net_IDNA::getInstance();

if (isset($_REQUEST['encode'])) {
    $decoded = isset($_REQUEST['decoded'])? $_REQUEST['decoded'] : '';
    
    try {
        $encoded = $idn->encode($decoded);
    }
    catch (Exception $e) {
        /* just swallow */
    }
}

if (isset($_REQUEST['decode'])) {
    $encoded = isset($_REQUEST['encoded'])? $_REQUEST['encoded'] : '';
    
    try {
        $decoded = $idn->decode($encoded);
    }
    catch (Exception $e) {
        /* just swallow */
    }
}

if (!isset($encoded)) {
    $encoded = '';
}

if (!isset($decoded)) {
    $decoded = '';
}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<title>Punycode Converter</title>

body
{
    font-family:        Helvetica, Arial, sans-serif;
    font-size:          10pt;
    background:         rgb( 255, 255, 255 );
}

#centered
{
    text-align:         center;
    vertical-align:     middle;
}

#round
{
    background-color:   rgb( 240, 240, 240 );
    border:             1px solid black;
    text-align:         center;
    vertical-align:     middle;
    padding:            4px;
}

#subhead
{
    font-size:          8pt;
}

</style>

</head>

<body>

<table width="780" border="0" cellpadding="0" cellspacing="0">
<tr>
    <td id="centered">
    <div id="round">
    <strong>IDNA Converter</strong><br />

This converter allows you to transfer domain names between the encoded (Punycode) notation and the
    decoded (UTF-8) notation.<br />
   
    Just enter the domain name in the respective field and click on the button right beside it to have
    it converted. Please be aware, that you might even enter complete domain names (like j&#xFC;rgen-m&#xFC;ller.de),
    but without the protocol (<strong>DO NOT</strong> enter http://m&#xFC;ller.de) or an email address.<br />
   
    Since the underlying library is still buggy, we cannot guarantee its usefulness and correctness. You should
    always doublecheck the results given here by converting them back to the original form.<br />
   
    Any productive use is discouraged and prone to fail.<br />
   
    <br />
   
    Make sure, that your browser is capable of the <strong>UTF-8</strong> character encoding.<br />
    
    <br />
    
    <table border="0" cellpadding="2" cellspacing="2" align="center">
    <tr>
        <td class="thead" align="left">Original</td>
        <td class="thead" align="right">Punycode</td>
    </tr>
    
    <tr>
        <td>
        <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="GET">
        <input type="text" name="decoded" value="<?php echo $decoded; ?>" size="24" maxlength="255" />
        <input type="submit" name="encode" value="Encode &gt;&gt;" />
        </form>
        </td>
        
        <td>
        <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="GET">
        <input type="submit" name="decode" value="&lt;&lt; Decode" />
        <input type="text" name="encoded" value="<?php echo $encoded; ?>" size="24" maxlength="255" />
        </form>
        </td>
    </tr>
    </table>
    </div>
    </td>
</tr>
</table>

</body>
</html>