Re: Re: How to find out if PC is online

What i meant to say was if gethostbyaddr(ipadress) responds with something else than the ipadress then this PC must be online. Or am I wrong?? Jocjem B.A.T. Svensson wrote:

And precisly how does the mechnaism with gethostbyaddr(), e.g. an DNS request, work to be able to resolve the issue about weather a particular host i online or not? As far as I know this is not possible. The only thing one might be able to say after a successfull DNS look up is this-or-that host has a registered entry in the DNS server. Nothing more can be deduced. If I messed something here, please fill me in. -----Original Message----- From: J.Veenhuijsen To: php-windows@lists.php.net Sent: 2003-12-01 12:53 Subject: [PHP-WIN] Re: How to find out if PC is online Try : gethostbyaddr (PHP 3, PHP 4 ) Get the Internet host name corresponding to a given IP address string gethostbyaddr (string ip_address) Returns the host name of the Internet host specified by ip_address. If an error occurs, eturns ip_address. See also gethostbyname(). Jochem Jan Hrebenar wrote:

Hello All, I`d like to make script which will detect if my computer at IP xxx.xxx.xxx.xxx is online. I try to use system("ping") but this function is not allowed on server. Can somebody tell me if exist any other way to do this? Pls excuse my english