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！+ E& O6 G9 W  D8 a0 D
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。, C9 z1 [' y& K' o) V7 ]
首先我创建MYSQL数据库表。* {8 {& Y- j1 x3 W# b1 X& g
CREATE TABLE tablename (+ L7 M6 N- z2 p( u
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。3 d8 j8 y& n7 h& e2 \. y0 [0 `
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),9 q/ h! s1 c0 f- T8 I  k* R
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。8 q1 J" e, e0 m/ h$ X
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名$ l) E: u9 e9 j5 s- K
$db_pass = "password"; //你的mysql的密码" M7 t( {' B( P9 B' @3 N0 w( {
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)# ~$ C6 x9 w$ A4 {1 U, m! P
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?php4 c4 t, M) T, P) r
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any, Y$ [/ C4 h+ z, B' x
$database = "users"; //the db name& S4 P. ^" q6 ]0 p- Z- Z5 I
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;
?>连接mysql  T. {/ P$ h0 Z; O( K3 O
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
mysql_connect($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# p: X+ {) S3 P
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");& @$ Y+ A* P% A  O( ]5 r7 C
如果用户用错误信息的话，这样处理。1 {5 @* J9 V  e
if(!($insert)) {
print "Useronline Insert Failed > ";+ ?; P% |# ^8 A2 ?8 a: y. ]
}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<$timeout");同样给出删除记录出错的处理。! l' ]5 Y: x- t6 K
if(!($delete)) {4 N% B, R2 w9 R! {
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='".$_SERVER['PHP_SELF']."' ");使用9 b1 d: B7 [; A# _
mysql_num_rows(query);来统计用户，代码如下。; T$ [- x3 b, b
$user = mysql_num_rows($result);最后关闭数据库。" A4 \" M* N% v8 }# n
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");- c6 ?' U+ Y! n0 Y: Z# `
}最终把上面代码写成一个PHP文件如下。
<?php
//Put your basic server info here& K9 l* H" E3 r+ R' z6 b, x
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username; b+ T% s1 x; s& j( v# }" k
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are) l  \% P& l- Y% h$ @- X* [4 K* Q
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
// $timeoutseconds seconds)( X) c! e% Y+ J2 S' M7 K9 N
//this is where PHP gets the time6 X3 L! c' w% R/ s
$timestamp = time();* l) ^$ ^8 a( t7 T
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed* W- J; t. E; f; B
$timeout = $timestamp-$timeoutseconds;# T% ]) w! b! g  G0 b( J  T( s
//connect to database
mysql_connect($server, $db_user);/ l/ `5 d$ L& p- A0 L2 J
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES' j4 B: l# J, ^# w+ [
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {6 L' Q. o/ _2 @0 r0 }0 H8 Q+ g
print "Useronline Insert Failed > ";
}1 ^9 B+ n9 J4 t
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");4 c3 u: a+ d+ y! e' l9 Q6 I
if(!($delete)) {7 D) A5 N/ _( @" J3 }
print "Useronline Delete Failed > ";& f9 M$ K. U/ T2 C1 n5 E9 W
}
//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 > ";3 k& n* D6 E+ d/ a+ e& ^0 k$ X
}
//Count the number of rows = the number of people online  O+ b1 z9 G7 e) C  U/ v' E
$user = mysql_num_rows($result);
//spit out the results2 b  J! S0 `8 c
mysql_close();; j3 r3 y/ o* Z1 i" p
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}
?>9 j# b. q/ I$ o  f# k9 v

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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。: o# p5 N F+ ~! T T3 p+ i1 G5 V! J
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。. k& n/ H* U* h% y' D6 D
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
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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