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！/ ]( k3 v0 N: b( ^- P
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。+ g  o7 m! X) \! H' w6 w# N: f( A; ^
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL, |5 q! i* r) U+ L- z
}可以使用的SQL语句。; I6 d9 q/ N9 T3 v* @6 P6 X0 C: q
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),+ A# @' t  G5 V# v  ?8 K
KEY file (file)( M' X; ?% I' T( Q1 z; N8 S. g
);下面我们是PHP脚本，首先我定义MYSQL的信息。! x, J( Z4 d0 h; h" @: `- R
$server = "localhost"; //你的服务器: R( P7 _& A% O: G
$db_user = "root"; //你的mysql的用户名' k: S% `, ]# q" z( T2 [: r2 I
$db_pass = "password"; //你的mysql的密码- ^% \5 t$ W9 @5 J+ M1 m& t
$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。0 z9 W# f. o- S" @2 F) `
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username  @0 [: z/ a, {
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit4 D% R2 \/ R3 u  [7 j; G
//get the current time
$timestamp = time();8 ^* o8 A$ [' T' F
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;+ P  x  C% H+ P% p- b
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接" k0 o; v% `7 T) {) b
mysql_connect($server, $db_user);查询数据库的代码：& H; N. f' Q/ m1 F' z! _
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']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。# \& q/ j( B3 A& E+ f! I
if(!($insert)) {
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。, y0 z+ Y0 u! n% h
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {2 x3 K" f; Z+ v6 H+ s: J2 N
print "Useronline Delete Failed > ";/ w- `) Q' [! n9 g5 n% g( @; G
}下面我们解决数据库中不同IP的问题5 C& w8 Y! p4 P
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用  J4 z, s  M6 a( a
mysql_num_rows(query);来统计用户，代码如下。: r+ p4 Q8 K6 h* u3 e/ F) u
$user = mysql_num_rows($result);最后关闭数据库。
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。" T7 ^. H+ W  }/ `  O/ {' q" J
<?php4 K" R1 k' {2 Z7 w% U, G! k( E
//Put your basic server info here+ |( t  }- l2 Z5 M
$server = "localhost"; //normally localhost7 t* H  k" t: d8 g: v. @! |9 z
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password: S% ]' F. b4 m2 Q7 ^1 n& q4 v
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are: Z( I$ y# t; c3 C4 [
// 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# Y' m. N; Z) F2 Y9 x  f
$timestamp = time();2 e2 s' @* ^' @7 E
//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" y* P7 K; {+ m3 R' C  q) y
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($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 > ";# q/ t/ h/ z5 j
}
//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)) {: L) K# ^. w7 h# v1 b  ~; Z4 v
print "Useronline Select Error > ";8 C( j+ y, M% y8 V8 K$ c0 z/ z
}# {' A% n6 g6 {# C2 S7 m
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results
mysql_close();3 z+ Q; @) v& ~' b6 h
if($user == 1) {! T8 L7 O4 f. |  s3 D1 h
print("1 user online\n");% }2 i3 a8 R+ S! z
} else {1 |/ p' d6 P9 w3 T5 p  H  y$ y
print("$user users online\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。
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。2 q! |0 B: R) {
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( i( l0 g( c; \" d) ~& b
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3 @1 s( ^5 i: C& F, n6 A I& C+ P
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ " |/ F% k# A8 g$ F! }
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=554 T; {3 v( i2 R- I# O+ e
自己加QQ去问吧。

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