(PHP 4, PHP 5, PHP 7, PHP 8)
checkdnsrr — Résolution DNS d'une adresse IP
Recherche l'enregistrement DNS de type
type correspondant à l'hôte
hostname.
hostname
hostname peut être soit une adresse IP au format
numérique, soit un nom d'hôte.
type
type peut être l'une des valeurs suivantes : A, MX, NS, SOA,
PTR, CNAME, AAAA, A6, SRV, NAPTR, TXT ou ANY.
Retourne true si un enregistrement a été
trouvé, et false en cas d'erreur ou si aucun enregistrement n'a été trouvé.
Note:
Pour une compatibilité avec Windows avant son implémentation, essayez la classe » PEAR : » Net_DNS.
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.