how i can make the Revenue Sharing system by php

How can I show something on 75% of requests, so that on average, every four page requests would result in three pages showing it, and one开发者_C百科 not.

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i dont know how it working with 70%

now how i can show in example echo iam; in a page in 70% percent

this mean it will appear 3 times and one not

The only fool proof way I can think to do this is:

if (($pageHits % 10) < 7)
    echo 'iam';

I don't know whether I got you correctly but you can do this:

$i = rand(0,3);
if($i < 3) {
    echo 'foo';
}

This will echo foo in 75% of all visits.