Cloudflare + FritzBox -> DynDNS

updateDns.php

<?php
/*
FRITZ!Box DynDNS Howto:
Update-URL:	http://your-domain.tld/filename.php?user=<username>&pass=<pass>&hostname=<domain>&myip=<ipaddr>
Domainname:	dyndns.your-domain.tld
Username:	your-cloudflare-email-address
Password:	your-cloudflare-api-token
*/

// static config:
$cfZoneId =	""; //put your CloudFlare Zone ID here
$cfDnsId =	""; // put your CloudFlare DNS Identifier here

// dynamic config
$cfEmail =	$_GET['user'];
$cfApikey =	$_GET['pass']; 
$updateDomain =	$_GET['hostname'];
$ipAddr =	$_GET['myip'];

$cfUrl =	"https://api.cloudflare.com/client/v4/zones/".$cfZoneId."/dns_records/".$cfDnsId;

$data = array(
  "type" => "A",
  "name" => "{$updateDomain}",
  "content" => "{$ipAddr}",
  "ttl" => 120,
  "proxied" => false,
  );

$curl = curl_init($cfUrl);

curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "PUT");
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-Type: application/json',"X-Auth-Email: $cfEmail","X-Auth-Key: $cfApikey"));
curl_setopt($curl, CURLOPT_POSTFIELDS, json_encode($data));


$response = curl_exec($curl);
if (!$response) {
    die("Connection failure.");
}else{
	var_dump($response);
}

?>

Hey, what do u mean with "CloudFlare DNS Identifier" ?