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！. h1 M4 k% u- \- u# U0 d3 ]
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。" E# L+ _8 D4 U- Y9 ]
首先我创建MYSQL数据库表。
CREATE TABLE tablename (( W# K# s: X$ C: q
field type(max_length) DEFAULT 'default_value' (NOT) NULL( v5 j, M% v8 G" ]& x
}可以使用的SQL语句。  _* N& h( E. c! b7 S, s2 Y
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL," S0 W! M4 }) ^! |
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),4 I1 n/ M; w' k4 d& N) b* n2 i8 r
KEY ip (ip),
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6 X3 V- L4 G# y! F0 z4 j
$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)
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?php) `; G; j0 p3 D2 _- q/ Q: ?* M0 L
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any5 K9 K! U* E+ q1 X: M$ c& ~- q
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit6 ~6 \% T) _0 r$ s# R* C2 w' N
//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。( j0 U6 Z. M3 L3 c) m
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, $db_user);查询数据库的代码：/ G/ E. H# b" c$ [
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']."')");7 `3 R2 V) \( {6 Z# K5 {
如果用户用错误信息的话，这样处理。* Y; N; x* x) n) ~
if(!($insert)) {3 C. [5 y1 q" U1 ]
print "Useronline Insert Failed > ";8 f/ j$ {& n4 ]% n# G' t; y
}然后实现当超过设置的时间就删除该用户记录。  r5 S% {% [# t
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。8 [  t8 o, T, c: S6 i
if(!($delete)) {
print "Useronline Delete Failed > ";% S% n: R3 w! D
}下面我们解决数据库中不同IP的问题1 D3 U8 u  i  \6 q
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用5 x4 O! k3 Z6 x; ?( K
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。/ v  h9 V' Z1 O. O7 }
mysql_close();显示在线的人数。% F' f/ T& W8 X% w
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。' \$ }3 l' o' @" U0 X/ M2 `
<?php
//Put your basic server info here
$server = "localhost"; //normally localhost) x  H  b1 J" S( @8 S
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are0 ^2 [2 r7 A$ p+ s5 ?2 w
// 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
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed) y( J2 y8 f# p8 O% {' y& P8 l5 `
$timeout = $timestamp-$timeoutseconds;
//connect to database5 k- C+ e4 J& i  D  {" ~$ D
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list5 c/ E# O) [* I+ E, O. C7 f
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES3 V! s3 e1 @- b  P
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");) A  R$ F7 d& ?, i
if(!($insert)) {
print "Useronline Insert Failed > ";% X$ v5 ?6 e" H7 Q; v
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.1 e0 `9 b2 l8 G2 x* b" `. Y2 f
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");$ J5 w, E: w- w# k3 a1 P3 k; s+ D
if(!($delete)) {
print "Useronline Delete Failed > ";8 S, u! K& V7 {6 }
}% D% v0 ]7 B* R+ B
//select the amount of people online, all uniques, which are online on THIS page6 J/ N& r. v7 o! V0 L! G
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {
print "Useronline Select Error > ";0 A" Q' B3 a; o3 G
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results
mysql_close();1 l, E  Y$ e' [2 I6 g; g
if($user == 1) {
print("1 user online\n");" U- A% G' P# r: u/ ?: ]
} else {
print("$user users online\n");0 p7 _9 ]$ `# p$ H1 j" w
}8 F: c( i& @$ W/ d4 Y4 z! ~( Z& N
?>- _4 L* j, c6 p& v

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。# I0 f4 E+ _1 G/ l8 m
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。3 o  L9 S2 G/ ^% Y3 e
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* @( R5 s7 w3 A+ E9 j  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
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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