What's my IP, Fritz!Box?

ip.php

<?php

/*
 * PHP-only solution for obtaining external IP from Fritz!Box
 *
 * Based on https://stackoverflow.com/questions/5647461/how-do-i-send-a-post-request-with-php#6609181
 * brought to you by [email protected]
 */

// curl -s "http://fritz.box:49000/igdupnp/control/WANIPConn1" -H "Content-Type: text/xml; charset="utf-8"" -H "SoapAction:urn:schemas-upnp-org:service:WANIPConnection:1#GetExternalIPAddress" -d "@external_ip.xml" | grep -Eo "\<[[:digit:]]{1,3}(\.[[:digit:]]{1,3}){3}\>"

$tr64 = <<<EOD
<?xml version="1.0" encoding="utf-8" ?>
<s:Envelope s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Body>
    <u:GetExternalIPAddress xmlns:u="urn:schemas-upnp-org:service:WANIPConnection:1" />
  </s:Body>
</s:Envelope>
EOD;

$headers = <<<EOD
Content-Type: text/xml; charset="utf-8"
SoapAction:urn:schemas-upnp-org:service:WANIPConnection:1#GetExternalIPAddress
EOD;

$url = 'http://fritz.box:49000/igdupnp/control/WANIPConn1';

// use key 'http' even if you send the request to https://...
$options = array(
    'http' => array(
        'header'  => $headers,
        'method'  => 'POST',
        'content' => $tr64
    )
);
$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);
if ($result === FALSE || !preg_match("/ExternalIPAddress>([0-9.]+)</", $result, $m)) {
	var_dump($result);
}
else {
	echo $m[1];
}