Rotating Advertisement Script

For working version, updated code and troubleshooting tips, see
http://www.i-fubar.com/rotation-ad-script.php

First, create a file with a name like adverts.php and have this at the top: 
<? 
$bannerCounter= 1; 

For each of your advertisements, you'll first write out the ad's code, and then increase the banner counter, like this: 
$bannerCode[$bannerCounter] = "put your ad code here"; 
$bannerCounter++;

For the example below, let's do a 3-banner rotation. Note that every " in your ad code needs to be "escaped" with a slash mark in front of the code. 
$bannerCode[$bannerCounter] = "<A HREF="http://www.amazon.com/exec/obidos/redirect-home/teijn21-20">
<IMG SRC="home-banner-468x60.gif" BORDER="0" HEIGHT="60" WIDTH="468" alt="In Association with Amazon.com"></A>"; 
$bannerCounter++;

$bannerCode[$bannerCounter] = "<a href="http://www.vmcsatellite.com/?aid=55537" target="_top"> <img src="http://www.vmcsatellite.com/banners/468x60(2).gif" width="468" height="60" alt="Free Satellite TV!" border="0"></a>"; 
$bannerCounter++;

$bannerCode[$bannerCounter] = "<a href="http://www.vmcsatellite.com/channels/affiliates.cfm?aid=55537" target="_top"> <img src="http://www.vmcsatellite.com/banners/recruit395x141.gif" width="395" height="141" alt="Free Satellite TV!" border="0"></a>"; 
$bannerCounter++;


Next, we get the total number of ads, and if there are more than one, we'll randomly pick one of them. (If less than one, we automatically pick the first one.) 
$bannerAdTotals = $bannerCounter - 1; 
if($bannerAdTotals>1) 
{
   mt_srand((double)microtime() * 1234567); 
   $bannerPicked = mt_rand(1, $bannerAdTotals); 
}
else
{
   $bannerPicked = 1; 
}
$bannerAd = $bannerCode[$bannerPicked]; 
?> 
That's the end of the adverts.php file.
 
Now, your webpage showing the ad first needs to include this script, then show the ad, like this: 
<? 
include_once("adverts.php"); 
echo "<div align='center'>$bannerAd</div>
?>
That's all!


For working version, updated code and troubleshooting tips, see
http://www.i-fubar.com/rotation-ad-script.php