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php 在线人数统计代码分析例子!

发表日期:2009-03-23 摄影器材: 点击数: 投票数:
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。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}
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)
);
我们下面开始使用PHP脚本,首先定义MYSQL的信息。
$server = 'localhost'; //你的服务器---电脑教程技术学习网
$db_user = 'root'; //你的mysql的用户名---电脑教程技术学习网

$db_pass = 'password'; //你的mysql的密码---电脑教程技术学习网

$database = 'users'; //表的名字---电脑教程技术学习网

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:
$server = 'localhost'; //your server
$db_user = 'root'; //your mysql database username
$db_pass = 'password'; //your mysql 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
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)---电脑教程技术学习网

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。---电脑教程技术学习网

$insert = mysql_db_query($database, 'INSERT INTO useronline VALUES
('$timestamp',''.$_SERVER.'',''.$_SERVER.'')');
然后我们给出如果用户用错误信息的处理方式。
if(!($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。
$delete = mysql_db_query($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
$result = mysql_db_query($database, 'SELECT DISTINCT ip FROM useronline WHERE file=''.$_SERVER.'' ');
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。
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。---电脑教程技术学习网

//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.'',''.$_SERVER.'')');
if(!($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=''.$_SERVER.'' ');
if(!($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');
}
?>
^_^,成功了!!!
大家可以试一下,或者用文件做数据库来存储呢~~~

作者:sphil

《php 在线人数统计代码分析例子!》


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