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。( w% v8 k6 i5 j+ K% [& i1 Z' G& ]* H0 `
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。# y5 w, X. |& j5 q
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,  J% s/ v3 }* @- [$ }  a
ip varchar(40) NOT NULL,7 f8 H: R1 D7 T( N3 ^+ n0 N
file varchar(100) NOT NULL,: Q9 W  g2 B1 p% y/ @* a" Y0 P
PRIMARY KEY (timestamp),
KEY ip (ip),) e/ I: f; Q2 ?+ v- e
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。+ o2 Q# }' D3 U8 T3 R* X3 e6 b
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名3 i1 {2 o! I' g6 t
$db_pass = "password"; //你的mysql的密码. L8 x9 z9 q7 e0 C- G, b, E2 I5 p
$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。. i, _: r+ t3 V
$timestamp = time();上面的完整代码：. v+ m" T- O' Q  U# u, |" a5 D
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username  F0 x. Q! Z4 P0 E+ j5 [3 p
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit3 T5 s2 _' d) ~
//get the current time
$timestamp = time();3 f# h2 F; g- z4 J. i9 r
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;; Q0 |9 T% C* g* ?+ I
?>连接mysql) f- v; @* y) c, \
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接" y" v, W2 i: l2 t  z' J* n0 ^
mysql_connect($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。
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES- A4 D% C5 _) _! l+ z1 I
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");/ o$ r, ~! r+ S. [4 C+ L& d" g
如果用户用错误信息的话，这样处理。
if(!($insert)) {( R+ Y$ U3 C- O$ Y$ e
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。3 ?# \. y. y3 k
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。* m2 k8 H& M+ ^3 Z2 N  Q
if(!($delete)) {
print "Useronline Delete Failed > ";/ Z- P9 z# c9 z' }
}下面我们解决数据库中不同IP的问题
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
mysql_num_rows(query);来统计用户，代码如下。7 M$ m# T  c; w' t; D( p
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。
if($user == 1) {% ~) Y7 n/ H) l; ?
print("1 user online\n");
} else {
print("$user users online\n");; |: x0 B  R0 O
}最终把上面代码写成一个PHP文件如下。
<?php( D" Z  G0 I" a# K- O, h) S
//Put your basic server info here
$server = "localhost"; //normally localhost  F+ F$ R+ q& \& O
$db_user = "root"; //your MySQL database username( O4 s3 q% r# d: k/ I
$db_pass = "password"; //your MySQL database password
$database = "users";" _& g. f+ w0 u$ L( x
$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& f7 |- G8 y8 T4 X* A
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;7 H9 [  }) h# r2 ?9 [
//connect to database/ f  u! f0 v8 X. j' A2 X
mysql_connect($server, $db_user);0 t: C; [0 A5 X' @! {
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES9 E0 z1 N% _* G$ m  I, o
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");# h9 |+ B! |: q; f0 }. k7 ~8 v' t
if(!($insert)) {/ d: A- Z* Z5 z/ N. ^9 g& }
print "Useronline Insert Failed > ";6 ~6 d8 Y1 y7 g: f- H$ T( r) {
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");0 q, F/ Q3 i) F6 u- }
if(!($delete)) {
print "Useronline Delete Failed > ";* D! J$ w/ S/ i" k
}( _# O' i: D) M, c8 t  x3 q
//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 > ";
}* J9 L2 j- x4 F+ A6 {: d
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results
mysql_close();9 i5 r- T8 @' n% {* [# s
if($user == 1) {
print("1 user online\n");! X: c* R. T6 B" W/ m7 E* e& x
} else {
print("$user users online\n");5 H& N7 K# O2 y2 e# ?# `# [( P
}3 @: J' T8 a# U
?>

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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。, h) e3 C, ?9 R: ?: }
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。
当然啦，这两款主机也是相当不错的。
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4 S0 g8 |$ q" n5 k% V/ \
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6 a+ ]" J8 Q5 r9 u! O
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; X8 B( ^) E$ G8 r& j
自己加QQ去问吧。

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