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# gethostbyaddr

(PHP 3, PHP 4, PHP 5)

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

## 说明

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 1. A simple gethostbyaddr() example

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

## 参见

gethostbyname()
gethostbynamel()

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