Server Status Script

I'm wondering if it's possible to display a servers status on our local intranet using PHP?

I want to have a little green dot displayed if the server is up and fine, an amber one if it is running slowly and a red one if it's offline.

Does anyone know of any software or script that can do this?

 

<?php

$url = 'http://example.com/';

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
$status = curl_exec($ch);

$time = round(curl_getinfo($ch, CURLINFO_TOTAL_TIME));

if (!$status)
{
	$icon = 'red';
}
else if ($time > 2)
{
	$icon = 'amber';
}
else
{
	$icon = 'green';
}

?>

<img src="<?php echo $icon; ?>.jpg" />

PHP:

 

If you're looking for something a bit more robust, rather than DIY, some people (mostly hosts, but it can be applied to different environments) like Status2k.