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。1 h- j  v0 F* g8 l7 @( ?5 V
首先我创建MYSQL数据库表。+ [: b0 R+ u  m( o' t4 s
CREATE TABLE tablename (+ \9 f" @2 S0 B) L
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。# `- ?' V& d6 S3 v! Y; h1 o1 G
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,9 T- p4 y# p& h" u3 }
ip varchar(40) NOT NULL,  _6 ^$ ]& b% ?, I
file varchar(100) NOT NULL,, {5 t: H1 m4 P' y! j6 Y
PRIMARY KEY (timestamp),7 N# A. |* h. H6 H* {
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。- K3 y+ f5 t4 K  H; x, b
$server = "localhost"; //你的服务器& L2 z* z2 j6 s- O
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码( S& w0 E' O9 T  f
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)5 S7 p# b( q5 _( D! o% Y! }
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?php7 ?3 {) j+ B" `) [" Y' @
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any  w4 ?- A% {& @% G; c* i" F/ B
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit6 t7 D$ f' A( R" M* D. g7 e+ E
//get the current time
$timestamp = time();% d/ V2 U2 }& `7 h0 l# I
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;& W1 e- p4 U# y4 ?& p$ ^2 {
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。, Y1 Z( ~( {7 P9 b; I/ @" A
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接# ^4 V- g8 ^% x! b
mysql_connect($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。2 J; B3 V+ ^5 C
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");# _* T' e/ f4 [5 i% A! d
如果用户用错误信息的话，这样处理。
if(!($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。3 A  @. A6 L7 ~/ @3 K
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题' q# s7 e3 n7 R/ o- O
$result = mysql_db_query($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。3 {2 S/ \# ?- _0 B6 G9 `& O. V# R
$user = mysql_num_rows($result);最后关闭数据库。. S4 [" z8 ?6 {1 P& K
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");6 ^( G. s2 \! V4 w# G8 @
} else {
print("$user users online\n");9 Z; {5 Z0 `3 x& w1 N
}最终把上面代码写成一个PHP文件如下。" f& e% _: v" r% b- R
<?php
//Put your basic server info here
$server = "localhost"; //normally localhost
$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 last1 Y- b. a' t& l& x4 a% \1 X
// $timeoutseconds seconds)
//this is where PHP gets the time  U1 @5 T1 c0 b
$timestamp = time();5 M6 U! ^! e( T3 a) T, y7 L' Q
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;( }2 Y7 z/ ^8 J0 b/ K* y# n
//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+ }2 M. b9 F( l! g4 D
('$timestamp','".$_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<$timeout");* q6 t& o& M* }9 }6 b
if(!($delete)) {6 e# V7 w7 t) g. B
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page9 B  c; z' c* [/ i/ `' G  y
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");$ J8 Z* u; d' z+ u
if(!($result)) {* \8 X( K* ?6 K3 X2 ~) }/ h3 Q9 p, T
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results7 q1 M! F9 A# _! h4 u* z
mysql_close();7 B1 f/ Z! f1 Z3 j. l
if($user == 1) {+ O; F/ y5 @: ^4 J% Y; p* t+ g
print("1 user online\n");$ @, j, z; N( U" @; n
} else {
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。4 ~1 J$ C6 E) ?2 `
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
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 |- q0 W8 ?$ l" v) \& 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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