Why dont you log user ip and browser in the database. Then code like this
if(mysql_query(select from visitors where ip = '$ip', browser ='$browser', time = '$time'));
{
} else{
code here to add to database.
}
then count for whois online today.
if(mysql_query(select from visitors where ip = '$ip', browser ='$browser', time = '$time'));
{
} else{
code here to add to database.
}
then count for whois online today.
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