Need to select vistors from google

[Mohamad]

Hello

I need to write a special message appeared in my site header only to my visitors which come from Google

how can i do that ?

[dreamcatcher]

if (isset($_SERVER['HTTP_REFERER']) && strpos($_SERVER['HTTP_REFERER'],'www.google.com')!==FALSE) {
// display something
}

dc

[Mohamad]

Thank you very much dreamcatcher