通过PHP+MYSQL实现 网站在线人数统计

CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
Prima(最完善的虚拟主机管理系统)RY KEY (timestamp),
KEY ip (ip),
KEY file (file)
);

<?php
//Put your basic server info here
$server="localhost"; //normally localhost
$db_user="root"; //your MySQL(和PHP搭配之最佳组合) database username
$db_pass="password"; //your MySQL(和PHP搭配之最佳组合) 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-$timeoutseconds;
//connect to database
MySQL(和PHP搭配之最佳组合)_connect($server, $db_user);
//add the timestamp from the user to the online list
$insert=MySQL(和PHP搭配之最佳组合)_db_query($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.
$delete=MySQL(和PHP搭配之最佳组合)_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
if(!($delete)) {
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page
$result=MySQL(和PHP搭配之最佳组合)_db_query($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
$user=MySQL(和PHP搭配之最佳组合)_num_rows($result);
//spit out the results
MySQL(和PHP搭配之最佳组合)_close();
if($user==1) {
print("1 user online\n");
} else {
print("$user users online\n");
}
?>