Check url is live

freddo · August 16th, 2004, 06:31 PM

I want to check that a particular url or ip address is actually live before linking to that site.
What code would I need to do this?
Thanks

Snib · August 16th, 2004, 06:34 PM

I don't think this is possible with PHP.

I'll let you know if I think up anything, though.

Snib

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freddo · August 16th, 2004, 06:36 PM

can it be done in any otehr way?

richard.york · August 16th, 2004, 08:00 PM

What you are talking about is called a ping command.

There are a couple of ways to go about it from PHP. The most obvious is to execute a command line ping and this is done differently depending on your OS.

I would suggest having a look at the PEAR Net_Ping package, which provides all of the different commands that different operating systems provide for pinging a location in one object.

http://pear.php.net/Net_Ping

HTH!

Regards,
Rich

--
[http://www.smilingsouls.net]
[http://pear.php.net/Mail_IMAP] A PHP/C-Client/PEAR solution for webmail

richard.york · August 16th, 2004, 08:11 PM

You can also write a simple test script...

Code:

<pre>
<?php
    echo shell_exec('ping http://p2p.wrox.com');
?>
</pre>

-or-

Code:

<pre>
<?php
    echo `ping http://p2p.wrox.com`;
?>
</pre>

Using the backtick operator is identical to the shell_exec function.

That's the Windows ping. You'll see exactly the same output here as you would by pinging the domain at the command line.

Regards,
Rich

--
[http://www.smilingsouls.net]
[http://pear.php.net/Mail_IMAP] A PHP/C-Client/PEAR solution for webmail