通过PHP MYSQL实现网站在线人数统计_PHP教程

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推荐：《PHP设计模式介绍》关于本书说明
中国站长站关于《PHP设计模式介绍》的说明《PHP设计模式介绍》一书的英文原名是“ Guide.to.PHP.Design.Patterns ”，此书由Marco Tabini & Associates, Inc.出版，原作者是Ja

网站在线人数的程序代码，后台有MySQL(和PHP搭配之最佳组合)数据库支持。可以直接统计出网站当前的在线人数。

首先是创建MySQL(和PHP搭配之最佳组合)数据库表。

CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}

可以使用的SQL语句。

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)
);

下面我们开始使用PHP脚本，首先定义MySQL(和PHP搭配之最佳组合)的信息。

$server = "localhost"; //你的服务器
$db_user = "root"; //你的MySQL(和PHP搭配之最佳组合)的用户名
$db_pass = "password"; //你的MySQL(和PHP搭配之最佳组合)的密码
$database = "users"; //表的名字

设置统计的时间(多少秒内在线人数)

$timeoutseconds = 300;

取当前时间。

$timestamp = time();

上面的完整代码：

<?php
$server = "localhost"; //your server
$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 if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;
?>

连接MySQL(和PHP搭配之最佳组合)

MySQL(和PHP搭配之最佳组合)_connect('localhost', 'username', 'password');

也允许使用变量形式。

MySQL(和PHP搭配之最佳组合)_connect($server, $db_user, $db_pass);

如果MySQL(和PHP搭配之最佳组合)数据库没有密码的话可以使用下面代码连接（当然建议大家一定要设置好自己的密码，这样起码黑客得要解密啊）

MySQL(和PHP搭配之最佳组合)_connect($server, $db_user);

查询数据库的代码：

MySQL(和PHP搭配之最佳组合)_db_query('database', 'query');

我们只要有访客就要增加一条记录。

$insert = MySQL(和PHP搭配之最佳组合)_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");

然后我们给出如果用户用错误信息的处理方式。

if(!($insert)) {
print "Useronline Insert Failed > ";
}

然后我们得实现当超过我们设置的时间我们就要删除该用户记录。

$delete = MySQL(和PHP搭配之最佳组合)_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");

同样给出删除记录出错的处理。

if(!($delete)) {
print "Useronline Delete Failed > ";
}

下面我们显示数据库中有多少个不同的IP

$result = MySQL(和PHP搭配之最佳组合)_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");

我们使用MySQL(和PHP搭配之最佳组合)_num_rows(query);来统计用户，代码如下:

$user = MySQL(和PHP搭配之最佳组合)_num_rows($result);

最后我们要关闭数据库。

MySQL(和PHP搭配之最佳组合)_close();

显示在线的人数。

if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}

最终把上面代码写成一个PHP文件如下。

<?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");
}
?>