刚用PHP写了一个网站在线人数的程序，请大家进来指点下！

主机, 虚拟主机

刚用PHP写了一个网站在线人数的程序，请大家进来指点下！
我是用PHP+MYSQL来写的，原理：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。  v, _; J3 C3 \) y
首先我创建MYSQL数据库表。
CREATE TABLE tablename (3 N: C1 D$ Y1 ^0 Z: ?; w
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,2 L+ W; _6 [7 G# t7 O4 R9 T! ~
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),
KEY file (file)) M5 N" c! i7 M) s+ Z
);下面我们是PHP脚本，首先我定义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)3 Z5 _8 s# z+ i
$timeoutseconds = 300;取当前时间。+ b% L/ A4 S: w& W( O& h. }6 S) a
$timestamp = time();上面的完整代码：
<?php1 d- b& s: P& G
$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' p, N. [  ]4 a7 [
//get the current time
$timestamp = time();) [: k9 ~0 H/ P3 E& S* d2 v( ?9 R
//calculate the lowest timestamp allowed6 e, v: r" m) `) v+ A( J" u* }( m2 K- O
$timeout = $timestamp-$timeoutseconds;4 Z' c- y1 e" ~6 p$ n
?>连接mysql6 T2 @3 a& r4 ~1 a1 o1 c
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
mysql_connect($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。& B' i/ D- m! K. {
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。
if(!($insert)) {
print "Useronline Insert Failed > ";* G2 d; O* |; _2 I
}然后实现当超过设置的时间就删除该用户记录。) V, ^, D3 F* J
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。* y# o* A: ^  b. r) ~/ ^% u- J3 g
if(!($delete)) {6 r# N/ t+ e$ p9 r' ?! O
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题# R7 S/ ^' V) z1 B- P
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
mysql_num_rows(query);来统计用户，代码如下。
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。
if($user == 1) {8 Q  a, J5 r2 f0 f$ ~% i
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 localhost1 I" @+ R6 A/ q- f" F( o+ [+ k
$db_user = "root"; //your MySQL database username- c( S9 }3 g5 v4 S+ G3 p# r) f# l
$db_pass = "password"; //your MySQL database password+ n" k/ y" J* A7 y* S- g# D
$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- O: A; I, {/ A1 }" B
// $timeoutseconds seconds)1 M# j9 {; W% |0 \
//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);# D) z% f/ B7 L% L2 K
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES# W$ A+ p% @# g9 S; p
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {( G  b9 K7 D" \0 Q, @! k, }
print "Useronline Insert Failed > ";
}. E# F" e3 K8 I3 m% x
//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)) {) Y* v# s7 J* D: `$ Y; D
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page4 |2 H2 H* r# \8 u) x& d
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");- A/ d. j1 C9 c( h% H: A
if(!($result)) {
print "Useronline Select Error > ";
}  `9 P, H, E9 \, ]8 i( {
//Count the number of rows = the number of people online* o, K2 |! n- E
$user = mysql_num_rows($result);
//spit out the results4 ~. I4 W0 J4 J4 T2 D
mysql_close();+ s5 K0 B4 g# ~! W6 b
if($user == 1) {4 W! V/ q2 K  C" m& f
print("1 user online\n");
} else {
print("$user users online\n");3 k3 E, P! s* @/ y" C3 O- c, A
}! S4 a% r' z, H) }6 f
?>/ \! h- b: t- g7 N

以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。% \' ^1 ^; j4 _ Q" W
我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。; b. r& t& N& `6 y8 ^" l/ @
当然啦，这两款主机也是相当不错的。2 Q1 @( h" ?4 u8 }4 q" ?
智强商务B型：Unix /Linux 操作系统+独立网页空间1000MB+送1000MB邮局空间+100MB MySQL数据库空间=1869元/年
标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年! I; K& W2 V- ?* {0 H: T
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/
空间专线： 0756-2623871 QQ：168075865，好象还有全球免费网络电话:全球免费咨询电话 http://www.now.cn/callcenter/call.net?LineName=55
自己加QQ去问吧。

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刚用PHP写了一个网站在线人数的程序，请大家进来指点下！

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