以下為引用的內容：

//Put your basic server info here

$server = "localhost"; //normally localhost

$db_user = "root"; //your MySQL database username

$db_pass = "password"; //your MySQL database password

$database = "users";

$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are

// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last

// $timeoutseconds seconds)

//this is where PHP gets the time

$timestamp = time();

//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed

$timeout = $timestamp-$timeoutseconds;

//connect to database

mysql_connect($server, $db_user);

//add the timestamp from the user to the online list

$insert = mysql_db_query($database, "INSERT INTO useronline VALUES

('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");

if(!($insert)) {

print "Useronline Insert Failed > ";

}

//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.

$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp

if(!($delete)) {

print "Useronline Delete Failed > ";

}

//select the amount of people online, all uniques, which are online on THIS page

$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");

if(!($result)) {

print "Useronline Select Error > ";

}

//Count the number of rows = the number of people online

$user = mysql_num_rows($result);

//spit out the results

mysql_close();

if($user == 1) {

print("1 user online\\\\n");

} else {

print("$user users online\\\\n");

}

?>

總結

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