Change Random Number Every Hour ?

[dunlop03]

Im using this code to generate a random number:

<?php 
srand ((double) microtime( )*1000000); 
$random_number = rand(1000,5000); 
echo "$random_number"; 
?>

The problem is, I want this to generate a new random number every hour. So basically I want it to generate a number that lasts for 1 hour, then have it generate another number, automatically.

Is this possible, any ideas on how to do this?

Thank you in advance.

[SambaNeko]

Store your random number in a cookie that has a life span of one hour. If no cookie exists, create a new random number.

[penagate]

Is this random number specific to one client, or to the whole site/application? More details please.

[dunlop03]

Its for the entire site. I just need to set a different number every hour.

Im now using this inside my function, its sets a cookie for one hour:

srand(floor(time() / (60*60)));
       $output = rand() % 10000; 

What way could I implement the cookie option as described above?

[penagate]

If you use cookies, each user will see a different number. You need to store the number (and last update time) in a file or a database instead. On each page request, check if the time is greater than last update time plus one hour; if so, generate and save a new number.

[dunlop03]

You got any sample scripts of this?