Webpage Reference using Javascript

I want to identify from where a visitor coming to my webpage.Is there anyways to getting that reference in a javascript file.eg: if my website is www.example.com.if user getting this site from google or bing search,then i need to identify that,user from googl开发者_StackOverflow社区e or bing respectivly.How can i get this in javascript(more priority) or in php.If anybody know help me please...

You want to get the Referer information.

In PHP, you can access it with $_SERVER['HTTP_REFERER'].

In Javascript, I suppose that this should give you that information : document.referrer.

Note : the referer is an information that's sent by the user's browser, which means :

• It can, or cannot, be sent
  • Which means your application can use it to provide some additionnal stuff,
  • But must work even if the Referer is not there.
• It can be forged
  • Which means you must not trust it for any important feature.
  • And you might want to filter/validate it