Need help with cloaking/re-direct scipt!

Been working on this cloaking/re-directing script for Affiliate marketing purposes. I can't quite get it to work. I want to check the referrer domain that has gotten to my site. If it is a certain domain I want to display a page on my domain, and if it is any other referrer domain I want to re-direct to my affiliate link. Please help!

This is what mydomain.com/index.php looks like:

<?php

if(stristr($_SERVER[’HTTP_REFERER’],”referrerdomain.com/”)==FALSE)

{

header( 'Location: http://affiliatelink.com' ) ;

}

else
{
header( 'Location: http://www.mydomain.com/signup.html' ) ;
}

?>

PHP:

These are the errors I'm getting:

Warning: Division by zero in /home2/...../public_html/mydomain/index.php on line 3

Warning: Cannot modify header information - headers already sent by (output started at /home2/...../public_html/mydomain/index.php:3) in /home2/...../public_html/mydomain/index.php on line 13

Any help is greatly appreciated!!!

 

Try this.

<?php
if(stristr($_SERVER['HTTP_REFERER'],"referrerdomain.com/")==FALSE)

{

header( 'Location: http://affiliatelink.com' ) ;

}

else
{
header( 'Location: http://www.mydomain.com/signup.html' ) ;
}

?>

PHP:

Notice your double quote ( " ) became ( ” ) and also the single quote is having the same problem.

 

Your first if statement is also wrong.
As stristr returns a pointer, you have to use three = instead of two.
Like:

<?php
if(stristr($_SERVER['HTTP_REFERER'],"referrerdomain.com/") === FALSE)

{

header( 'Location: http://affiliatelink.com' ) ;

}

else
{
header( 'Location: http://www.mydomain.com/signup.html' ) ;
}

?>

PHP:

 

Or here is the simplest example

<?php
if (stristr($_SERVER['HTTP_REFERER'], 'google.com')) {
   echo 'You are from Google';
} else {
   echo 'You are not from Google';
}
?>

PHP: