Random PHP code with different results every hour [closed]

i have a random php for visit the url. this is my php.

<?php
$urlrandom = Array('http://google.com','http://yahoo.com');
$url = $urlrandom[array_rand($urlrandom)];
echo $url; 
//output per hour for 'google.com' -/+ 50 result
//output per hour for 'yahoo.com' -/+ 50 result
?>

can i use random url hourly with far different results every hour. suppose the result for "google.com" is 10 result and for "yahoo.com" 70 result. and the next hour is different from the previous hour.