Automatically Redirect People To Different Landing Pages in PHP

In an effort to differentiate my blog and other resources from my previous endeavors, I am deploying rudimentary A:B switches on entry to the site. Basically, consumer A is sent to landing page 1 and consumer B is sent to landing page 2. I am able to do this by parsing the incoming URL.

The simplest application would be to hard-code a few domains. e.g.

$ref=strtolower($_SERVER["HTTP_REFERER"]);
if((strstr($ref,"php") || strstr($ref,"host")) && !strstr($ref,"andrewkimball.com"))
{  
  header("Location: SQLAndCSharpStuff.php");
}

Smarter websites could do database lookups, set cookies, look at IPs, etc. All are rather straight forward, but are more complicated than I need for the basic setup.

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