Resolve IP to Hostname using PHP

How can 开发者_如何转开发I resolve an IP address to a hostname using PHP?

You can use the gethostbyaddr() function.

$hostname = gethostbyaddr($ipAddress);

Use gethostbyaddr()

$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);

echo $hostname;

You might find that this function can hang for some time when an address is not found - if this becomes a performance issue for you, check this manual comment which details a hand-coded method which supports a timeout.

gethostbyaddr()

You should give gethostbyaddr() a shot.