Re: [PHP] Checking if a host is online

From: Adam Maas (mykroft_at_mykroft.com)
Date: 11/29/03 

Date: Sat, 29 Nov 2003 12:20:32 -0500
To: Jason Giangrande <jason@giangrande.org>

Jason Giangrande wrote:
> I'm creating an application for an Intranet that, among other things, is
> supposed to check to see if particular hosts are online, and if so, what
> their IP address is. Anyone know how I can accomplish this? I tried
> using exec("host $host"); (where $host is the hostname) and while this
> gets the IP it gets the IP address sometimes even if the host is not
> active, because a DNS record for the system still exists. I also looked
> into the gethostbyname() function, but that has similar problems to
> using the external host command. I also tried to use an external ping
> command (ping -c 1 $host), and while I could get that to work, since it
> returns non-zero status if the host can not be contacted, it takes quite
> a while to execute for even a few hosts at once.
>
> Anyone ever do this king=d of thing before or have any suggestions on
> what might work?

why not try:

  passthru("ping $host");

Adam

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