If refferer=example.com echo=this else echo=that Please help on how to do that!

Hi,
i need a php code to check my refferer and if the refferer is an website which i have chosen it echos one thing else it echos the other thing.
can you help?
for example if $refferer="google.com"
urgent

 

Use $_SERVER['HTTP_REFERER']

http://www.php.net/manual/en/reserved.variables.php

 

Thanks alot for the reply, but can anyone give an example for my function please like a full working example?

 

if(GetDomain($_SERVER['HTTP_REFERER'])=='google.com')
{
    echo 'you are from google.com';
}


function GetDomain($url)
{
$nowww = ereg_replace('www\.','',$url);
$domain = parse_url($nowww);
if(!empty($domain["host"]))
	{
	 return $domain["host"];
	 } else
	 {
	 return $domain["path"];
	 }

}

PHP: