PHP+MYSQL实例:网站在线人数的程序代码

作者:网络 来源:佚名 更新时间:2008-12-06 03:39:35 点击:
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php实例教程:网站在线人数的程序代码,后台有mysql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数据库表。

以下为引用的内容:
create table tablename (
field type(max_length) default 'default_value' (not) null
}

可以使用的sql语句。

以下为引用的内容:
create table useronline (
timestamp int(15) default '0' not null,
ip varchar(40) not null,
file varchar(100) not null,
primary key (timestamp),
key ip (ip),
key file (file)
);

下面我们开始使用php脚本,首先定义mysql的信息。

$server = "localhost"; //你的服务器

$db_user = "root"; //你的mysql的用户名

$db_pass = "password"; //你的mysql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:

以下为引用的内容:
$insert = mysql_db_query($database, "insert into useronline values
('$timestamp','".$_server['remote_addr']."','".$_server['php_self']."')");

连接mysql

mysql_connect('localhost', 'username', 'password');

也允许使用变量形式。

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

如果mysql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_connect($server, $db_user);

查询数据库的代码:

mysql_db_query('database', 'query');

我们只要有访客就要增加一条记录。

以下为引用的内容:
$insert = mysql_db_query($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。

以下为引用的内容:
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。

$delete = mysql_db_query($database, "delete from useronline where timestamp<$timeout");

同样给出删除记录出错的处理。

以下为引用的内容:
if(!($delete)) {
print "useronline delete failed > ";
}

下面我们显示数据库中有多少个不同的ip

$result = mysql_db_query($database, "select distinct ip from useronline where file='".$_server['php_self']."' ");

我们使用

mysql_num_rows(query);

来统计用户,代码如下。

$user = mysql_num_rows($result);

最后我们要关闭数据库。

mysql_close();

显示在线的人数。

以下为引用的内容:
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。

以下为引用的内容:

<?php
//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<$timeout");
if(!($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");
}
?>