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。$ W9 l  m" S  d: A. b  S1 K
首先我创建MYSQL数据库表。$ h6 N# r; s2 S1 h% q+ F# f9 m* S
CREATE TABLE tablename (4 @6 c# f! b5 @
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。
CREATE TABLE useronline (+ j5 v' x: L$ Y- d( P
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,3 C: s. `; k/ X3 u9 k. U
PRIMARY KEY (timestamp),6 P2 G: K6 \" x/ Z
KEY ip (ip),2 R' c" ]7 x, v+ A- v& V  O
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。% c3 E0 L. b" I2 o) Q9 ^
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名2 F9 t. I$ O: q6 z6 y
$db_pass = "password"; //你的mysql的密码' {5 X- |1 Q2 V% O
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)9 Q" N, U! s2 W6 t1 z+ r/ ~1 z  \
$timeoutseconds = 300;取当前时间。9 O  O/ k5 t0 R$ ^. J
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username! R* v- r/ Y7 h. S) [3 Q1 Y
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit" j5 I$ m7 g2 z6 {& p$ u3 l
//get the current time
$timestamp = time();/ E: w0 o8 L$ ^4 R
//calculate the lowest timestamp allowed( {5 b* M5 w6 r) M' Y# |
$timeout = $timestamp-$timeoutseconds;
?>连接mysql" x  [( I& i  o. n) q& c* V" O% o7 `
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。/ ~, C" ~  a! m. Q) \+ j) K5 d8 [
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接6 |; K6 x& R) `4 a0 {
mysql_connect($server, $db_user);查询数据库的代码：, ?2 [$ f9 f9 |- l& f, @7 ?7 Z" H
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。1 P  ~  `5 c  I; l
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES* ?& W1 b) a/ u5 t2 u1 @. S  G1 V. Q: C
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。7 @4 Z# y, {% r, x6 x
if(!($insert)) {1 Z( i6 _( L# u) U$ G
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。9 o7 o2 N2 B' i
if(!($delete)) {$ {; j% U' |& v5 }
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题8 b6 M# F  ]% ^" D3 }7 i
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用9 j0 r8 Z5 b2 _7 W  q
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。6 l: G2 O. M( e" B3 a/ u
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。' O3 ~6 c# I/ Y8 g% z% t) M
<?php
//Put your basic server info here8 [) I, N, m# p! K" h
$server = "localhost"; //normally localhost. r' ?* v8 f5 A: O5 d$ P* K
$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) n; k+ k* z+ i# _' x7 A7 K
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();3 v- Q% W& M! C
//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' Z5 m& `3 i  `9 M6 j: w
mysql_connect($server, $db_user);/ V5 J' U9 p9 T' |
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES, ]. S- J# w3 K
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";  b* E0 y! g3 {: [  c- r
}3 _. q$ ^  |( A$ V; k. |
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");; O$ R0 P6 C3 L" Z( i/ o
if(!($delete)) {/ x- T1 u( s; ^& K% A9 J6 N- m, E
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)) {7 j  a5 o" j$ g6 g1 t, A# n% e
print "Useronline Select Error > ";# Q, G. p! n: O, L- A8 Y% X
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);7 q( V; Q4 |1 P$ A5 H4 M8 e4 v6 ]! n
//spit out the results
mysql_close();
if($user == 1) {
print("1 user online\n");+ c5 [4 z0 i- e: V
} else {
print("$user users online\n");/ Q; ^  E8 b" u2 j% |$ T! B
}
?>2 m. k+ b7 z7 x7 z, x

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。6 b* t* {/ d- {$ Y
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。- P0 r7 j+ R! V
当然啦，这两款主机也是相当不错的。( X' A4 ^! c/ Z* }0 G) o' L, ?
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 h8 c" V1 I' Z2 t0 N
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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