PHP Manual
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gethostbyaddr

(PHP 3, PHP 4 , PHP 5)

gethostbyaddr --  Get the Internet host name corresponding to a given IP address

Description

string gethostbyaddr ( string ip_address)

Returns the host name of the Internet host specified by ip_address or a string containing the unmodified ip_address on failure.

例子 1. A simple gethostbyaddr() example

<?php
$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);
  
echo $hostname;
?>

See also gethostbyname().

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fsockopen上一级gethostbyname