(PHP 4, PHP 5, PHP 7, PHP 8)
checkdnsrr — Verifica os registros DNS correspondentes para o nome do host ou endereço IP informado
Pesquisa o DNS para os registros do tipo informado em type
correspondentes ao nome do host definido em hostname.
hostname
hostname pode ser o endereço IP em
notação quádrupla separada por pontos ou o nome do host.
type
type pode ser: A, MX, NS, SOA,
PTR, CNAME, AAAA, A6, SRV, NAPTR, TXT or ANY.
Retorna true se o registro for encontrado; retorna false se não forem encontrados
registros ou se um erro ocorrer.
Nota:
Para compatibilidade com Windows antes desta implementação, deve ser usada a classe » Net_DNS do » PEAR.
criffoh at gmail dot com is right. Before you check domain, you must convert to ascii with idn_to_ascii function:
http://us2.php.net/manual/en/function.idn-to-ascii.php .
var_dump(checkdnsrr('ñandu.cl', 'A')); // returns false
var_dump(checkdnsrr(idn_to_ascii('ñandu.cl'), 'A')); // return trueImportant Warning:
You need to add a dot to the end of the host name to make a fully qualified domain name.
To see why, try executing the following pieces of code:
$d1="gmail.con";
$d2="gmail.con.";
$r1=checkdnsrr($d1, "MX");
$r2=checkdnsrr($d2, "MX");
var_dump($r1);
var_dump($r2);
You will see that without the dot it claims that the domain "gmail.con" is valid.
Note that if you time the "checkdnsrr()" calls you will also see it takes longer without the dot because it treats it as a relative domain and does several tries based on the host name it is running on.
NB: in case you're interested, being treated as a relative domain explains what is happening. If your host is "example.com" the relative domain will eventually resolve to "gmail.con.com." which can be looked up, hence it wrongly claims "gmail.con" existsI always think you should state the blindingly obvious.
A function that contains checkdnsrr will return false without an internet connection.
So in a production environment you need an active internet connection to return a true result with a valid email address.