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Check if a remote www-page is online...

Posted on 2006-11-19
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Last Modified: 2007-01-05
Hi,

I have a PHP-page that fetches information from another site, BUT the problem is that the site sometimes is not available or extremely slow. Hence, I would like to check if the site is online, prior to fetching the information from the site. How do I do that in the best way?

I have tried to use both
fsockopen("www.example.com",80);
and
file_get_contents()

Is there someway to set a timeout-limit?

Thanks in advance,
Jan
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Question by:madwax
1 Comment
 
LVL 13

Accepted Solution

by:
Robin Hickmott earned 1200 total points
ID: 17976721
You shoul be able to do this in the fsock declaration.

fsockopen ( string target [, int port [, int &errno [, string &errstr [, float timeout]]]] )

Basically declare

fsockopen("www.example.com",80,$errno, $errstr,5)

will time out after 5 seconds and you can use the $errno and $errstr values to ask why. You can then do

if (!fsockopen("www.example.com",80,$errno, $errstr,5)) {
      echo("Site is dead");
} else {
     echo("Alive");
}

If you want to set a limit on how long your script spends reading data then you can use

http://us2.php.net/manual/en/function.stream-set-timeout.php

This function shoulw allow you to set a timelimit on streams
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