I have an apache server set up on my computer.
To save bw, if this computer is on, images etc are to be called from this computer.
I know how to do this, but not how to check if computer is on.
I have made file server.ison and have found the following that works...

PHP Code:

<?php
$off = "No";
fopen("http://86.128.132.191/server.ison", "r") or die($off = "Yes");
echo $off;
?>

But, if i stop acache (simulating the computer being off) the error message
Warning: fopen(http://86.128.132.191/server.ison): failed to open stream: HTTP request failed! HTTP/1.1 200 OK in /home/thebulls/public_html/server.php on line 3 appears.

Basicly, what I am asking is: How do I stop error message appearing?

You can suppress error messages by using the @ operator:

PHP Code:

@fopen(..... 


How do i add timeout?

I think you may be able to:

PHP Code:

ini_set('default_socket_timeout', '60') 


Where 60 is the number in seconds.

Nope. Any other way of checking file exsists/'opanable' from a remote server?

Try this: http://www.webhostingtalk.com/archiv.../394004-1.html

SOLVED

SOLUTIONL

PHP Code:

<?php $up = @fsockopen("86.128.132.191", 80, $errno, $errstr, 1);  
if($up) 
{  
   $off = "NO";  
} 
else 
{
   $off = "YES";
} 
echo $off;
?>

If only I could give you more talkupation!!!

seems your socket fails so you get a response

if your on php5 use

PHP Code:

 $off = fasle;
 try{
  $off  = fsockopen("86.128.132.191", 80, $errno, $errstr, 1); 
 }catch(exception $e)
  header('Location: /yourerror_handler/?error=$e');
 } 


Which should prevent the nasty failure page been disaply by wrapping your site round a nice error page that display the error $e.

Your on's and offs are a little confusing, use bool values for this IE true : false. Much easier to work with plus a bool = 1 byte while ON or OFF = 2 and 3 bytes respectively. So a successfull connection would set off to true.

Ibbo

Now thats bandwidth saving to the extreme!

every byte counts