In this script (very easy script), we setup 3 ads for rotation. First ad, we want it to display 70%, second ad we want to display 20% and the last one we want to display 10%

1. Random number 1-100

if result = 1-70 (we have opportunity to display ad1, 70%)

if result = 71-90 (we have
opportunity to display ad2, 20%)

if result = 91-100 (we have
opportunity to display ad3, 10%)

Example:-

In this script, we use rand(1,100); to random number between 1 -100 and keep the result in variable
named "$result_random"
if result = 85 ad2 will be displayed.

PHP Code:

<?php 

//random number 1 - 100 

$result_random = rand(1, 100); 



// if result less than or equal 70, display ad1 (70%) 



if($result_random <= 70){

echo "Display ad1";

} 



// if result less than or equal 90, display ad2 (20%) 



else if($result_random <= 90){

echo "Display ad2";

} 



// if result less than or equal 100, display ad3 (10%) 



else { echo "Display ad3";} ?>