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。4 \, D; @) b1 v8 k5 ^: u) g
首先我创建MYSQL数据库表。
CREATE TABLE tablename ($ C; m7 N5 k: g; v1 V9 v0 M
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。8 h( [/ ^5 z! Y& E7 w( N
CREATE TABLE useronline (& K1 c: Q7 l) X) M4 X* ]7 t
timestamp int(15) DEFAULT '0' NOT NULL,) Q- C- k, |9 I
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),* {7 [5 F  S' g+ P, R' L
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。1 f/ C* L7 r  Z0 l2 l- ?
$server = "localhost"; //你的服务器$ R" A) C& g: c" }; z( L0 D
$db_user = "root"; //你的mysql的用户名% w/ L/ K5 V0 r: k7 z& y
$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), U  }, x2 L' D0 S% M* d# R- C
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：$ L$ j5 r& R4 Z
<?php" R  a" N- E* b; H
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name8 X+ q- {- R% l6 m" l( `* F: k
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();4 k& h+ u2 B4 h: [0 o& l/ A
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;/ P! P  _: ~( s8 ?
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
mysql_connect($server, $db_user);查询数据库的代码：$ w0 w$ _9 T9 h' M) Z1 p+ |5 P! P$ t. d
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) W9 }* p6 C2 ~+ B% _4 P+ J
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。; M9 [; z: j* R9 z" g* U
if(!($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。2 h' b1 M0 E" t/ `6 q
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {7 ^, e0 }0 k6 O# z
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题3 M  [: q! h9 ?, l. o
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用; h! r' @. \" A" B" }9 K, i- l6 i
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。
mysql_close();显示在线的人数。
if($user == 1) {! D  B) H7 \4 |" {- Y4 ~
print("1 user online\n");2 j( T8 U0 `6 Z1 E. H
} else {
print("$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. [1 j. Y- b! g! q8 K% \+ E
$server = "localhost"; //normally localhost) \8 C- P8 t* j( {: E6 Z
$db_user = "root"; //your MySQL database username; _1 ~' S- z& p! g
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are( K& Q  X# ~% [# A7 Z4 M& E& F/ Z' G
// 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- ?# n) o- @3 b) d7 r
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed+ ]( q( L0 t- w: A. A; ~1 R
$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
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {8 S, q% A  R+ d! N5 t% U
print "Useronline Insert Failed > ";
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.1 n+ r% b$ F( q  o
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");/ ^2 `( F; _8 X" g: D. o  l
if(!($delete)) {
print "Useronline Delete Failed > ";7 S4 B4 U0 c/ _+ P) \& o
}5 ?9 ~1 n5 {9 u% c
//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 > ";
}9 O3 E, J+ c% O  C8 T) r# g
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results1 e  o8 J8 ]& v' y
mysql_close();
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");/ F1 s% F& P; N2 {
}
?>3 z+ r0 _: K3 `

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。; C+ `! a$ p% d8 [& i
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。/ I( r, V" S- q2 q
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。5 t+ U# j% `( ]4 X8 r
当然啦，这两款主机也是相当不错的。: f4 q: i* u+ |! W! r( A
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- r+ |6 Y9 v# B4 ?5 g
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+ ^7 W- I" \. L& x+ J& P O( F* V
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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