Hello,
we have site, will add my ad code and users do also
but we need control percentage of ads impression, ex:

my ad code =" adsense code"
my ad code imp ="25%"

user ad code =" affilate code"
user ad code imp ="75%"

how we can do it with small and simple PHP code ?

PHP Code:

$rand = rand(1, 100);
if($rand <= 25)
{
     //your ad
}
else
{
     //their ad
} 


I suppose you could use the PHP GD image library to change the text on the image...

thanks for help

Also note that when you do this, you probably confuse Google about what ads are shown on your page. Every time an ad is displayed on a web page, it is trained to be used specifically with the content on that page.

This is something you won't find information on the Internet about, or how exactly Google treats deliberate randomization of ads on your site, but it is certain that even changing ad format of 1 ad placed in one place on your site can change the way their algorithm decides what to show in that ad. Especially when there are other ads in different formats, or different order in your source code, present on the same page.

It's a theory that has a high % likelihood to be true. Just something to be aware of. They do keep an eye on things like that because even something as little as 0.5% increase in how often their ads are clicked can mean 1 million more in annual earnings.