(PHP 4, PHP 5, PHP 7, PHP 8)
checkdnsrr — Comprueba registros DNS correspondientes a un nombre de host de Internet dado o dirección IP
Busca DNS de registros de tipo type
que corresponde a un host.
host
host puede ser la dirección IP
en notación decimal con puntos o el nombre de host.
type
type puede ser cualquiera de: A, MX, NS, SOA,
PTR, CNAME, AAAA, A6, SRV, NAPTR, TXT o ANY.
Devuelve true si los registros se encuentran; devuelve false si no se encuentran
registros o si ocurre un error.
| Versión | Descripción |
|---|---|
| 5.3.0 | Esta función está disponible en plataformas Windows. |
| 5.2.4 |
Se añadió el type TXT.
|
Nota:
Por razones de compatibilidad con Windows antes de que esto fuera implementado, se puede intentar con la clase » Net_DNS de » 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.