Showing ads only to 20% percent of visitors. Or different ads to another 80% visitors
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how to do this in a php file

Showing ads only to 20% percent of visitors. Or showing different ads to another 80% visitors

any way that can work, maybe using time intervals, like the visitors that visit the site at minute 0-12 only that show it, and visitors that visit the site at minute 13-59 is not. Or another methode

please help or share if you have, this should be easy enough and many people should need it, already googling it but still cant found it