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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.

示範 1.A simple gethostbyaddr() example
`<?php $hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']); echo $hostname; ?>`

See also gethostbyname().

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