help php timer

[Sifat3d]

I just want to make a PHP script that will act normal when visited,and
$do_secret_thing="no"; but ONCE every six hours when visited it will set:
$do_secret_thing="yes";
this Needs to happen ONCE every SIX HOURS.
Anyone please give me sample php code. I will be gratefull. Thanks in advance.:-)

[Rksk]

are u want to do it separatly for each visitors or just for al users at ones?

[Sifat3d]

All users. The six hours need to be serverside. Users have nothing to do with it

[Rksk]

You can store last Explose in a mysql record or just in a file. when a vistor visits ur site, it has to check time defferent between now n last Explose time. then if it more than 6h, just Explose it again n save last Explose time.

*Explose=ur secret thing :-)

[just_m3.]

you can do that with server crono job set it to your file accesing it once every 6 h .. :p

[ionutvmi]

if you want a php code

<?php
$last=file_get_contents("time.txt");
if(time() > ($last + (6*60*60))) 
{
    file_put_contents("time.txt",time());
    echo "special thing";
} else {
echo "nothing";
}
?>

but i would go for a cron job