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！8 V; J1 W, R# \. o; c2 h
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。
首先我创建MYSQL数据库表。) B- o* P7 W0 v
CREATE TABLE tablename (/ ^$ r  M" e- ~: g: K: T9 G
field type(max_length) DEFAULT 'default_value' (NOT) NULL, h# w" @$ V2 F/ i2 n  O% h
}可以使用的SQL语句。: I# q' u% h& h7 B) g% d7 j" p/ m
CREATE TABLE useronline (' r$ u5 X# d. @6 E8 u
timestamp int(15) DEFAULT '0' NOT NULL,2 U& D4 X. }" B9 n. G9 a
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),9 W4 F( t( T) G5 V) E% s  z
KEY ip (ip),. C; L, h8 j5 t6 H0 c( s
KEY file (file)
);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)4 Q/ y! B& C) g, u2 c  C2 J- q+ f5 l6 \
$timeoutseconds = 300;取当前时间。1 [& I# G/ b0 U7 L8 s* B
$timestamp = time();上面的完整代码：$ G, Y. H4 _1 K7 [
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name5 r  E* G  m9 r2 K( U4 D, S* T
$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。' H2 A; Y0 g$ q! ~. |' Y. F6 V
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接2 Z  g+ q6 t5 G# t
mysql_connect($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
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");. P6 A/ G  H$ ^$ n0 j
如果用户用错误信息的话，这样处理。
if(!($insert)) {- V$ {3 Z5 H2 c% y' S
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。& h2 f! G1 X  L8 Q4 p
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。9 I/ q% H" H* X. f
if(!($delete)) {
print "Useronline Delete Failed > ";
}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。- U2 V7 m0 {/ ~% ^1 f
$user = mysql_num_rows($result);最后关闭数据库。# b, Q5 \' \# o( X' z
mysql_close();显示在线的人数。
if($user == 1) {7 h" R8 m: ]: B3 E
print("1 user online\n");; s7 ~% u( M7 n, v. T( @% ]
} else {1 Q$ d* K' @% p& p( r( [$ u) V2 l9 j
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, w7 z0 K9 l/ k- p' z: K8 s& d
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username# g) h0 i) ~! r9 v: w; V
$db_pass = "password"; //your MySQL database password8 W; v5 M. B/ i! o1 _& w1 k
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are/ F2 R" Z5 \: w. b/ x; h, p1 l) D/ u
// 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 time7 k' ]* H( p& x, I, E+ n
$timestamp = time();8 g9 C2 S- T3 m
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed: N1 V4 j# v$ E
$timeout = $timestamp-$timeoutseconds;
//connect to database2 \+ S3 L  o2 N, r6 F6 O
mysql_connect($server, $db_user);' I% t) B  p, R4 [2 H' Y  \4 V
//add the timestamp from the user to the online list+ \" x* L! |7 n
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES, p" c( \# q  S, p3 G( B
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";7 q, V4 q" E# A9 @  U
}9 S9 D/ k# G2 j8 `  D
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.  d1 Y2 r/ z9 f- K
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");  B; o; ~& p7 k. y4 O
if(!($delete)) {$ V& b3 E. k0 F* o# B
print "Useronline Delete Failed > ";, P' R3 M/ Z+ `: K) o6 H% T! Y
}& V  i3 |4 G) {  d9 U4 H
//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)) {9 s. r2 |$ Y1 S% L, @6 Q5 b% T* f
print "Useronline Select Error > ";
}, Z7 x# l' {) V: x. J! Z& s6 v# @
//Count the number of rows = the number of people online0 u% e8 Y' S" y/ i+ z3 P
$user = mysql_num_rows($result);& z- ^- T6 [5 v/ y3 n
//spit out the results' W# l6 o! i7 F( g: F- i9 [: l( a
mysql_close();
if($user == 1) {, @* P% Q  M$ Y; X
print("1 user online\n");3 e7 {4 P* v, Y" s
} else {
print("$user users online\n");) q/ n/ {7 R- I7 ]) a. v2 T
}  ?/ D& H- m6 O" m: s
?>

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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。
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。( A- i0 C+ ~: ^
当然啦，这两款主机也是相当不错的。/ e! F9 p4 |$ u+ z9 W% D5 C( E9 ]
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( Y% H" S) j1 h$ y
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ - C: D- M. T7 N) x
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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