显示当前在线人数

介绍：

　　我们可以通过程序来显示当前的数据。

　　注重的两点：1.必须把下列代码放到扩展名为.PHP的文件中；2.在你的服务器上运行代码时，你的服务器必须支持MYSQL数据库。

　　代码如下：

　　下列代码放到你想显示信息的地方。


//EDIT THIS

$server = "localhost";

$db_user = "database username";

$db_pass = "database password";

$database = "database";

$timeoutseconds = 300;

//STOP EDITING

$timestamp = time();

$timeout = $timestamp-$timeoutseconds;

mysql_connect($server, $db_user, $db_pass);

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

('$timestamp','$REMOTE_ADDR','$PHP_SELF')");

if(!($insert)) {

print "Useronline Insert Failed > ";

}

$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");

if(!($delete)) {

print "Useronline Delete Failed > ";

}

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

if(!($result)) {

print "Useronline Select Error > ";

}

$user = mysql_num_rows($result);

mysql_close();

if($user == 1) {

print("$usern");

} else {

print("$usern");

}

?>

　　最后在MYSQL中修改你的 username 和 passwords