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。. v+ ~/ c" Z: }1 t% |0 C  K/ s
首先我创建MYSQL数据库表。* C: d7 z' N4 C  N: z
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL' }% s# }, o9 j# _- p
}可以使用的SQL语句。' M' S0 V& v: ^0 z; P
CREATE TABLE useronline (( s8 `3 e" H+ q! L% N$ B, |0 h
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),) {; c1 O, k8 b" b
KEY ip (ip),2 U# r: s9 n7 ]# I3 f" N; M
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。4 q, r* ~4 w5 d5 S) n
$server = "localhost"; //你的服务器3 m, {1 p' m/ N
$db_user = "root"; //你的mysql的用户名8 f3 X- q+ U" T) M! g/ T+ P
$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)0 N, q; Q% u" d
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?php0 o# v- z/ |# R) r1 o
$server = "localhost"; //your server& {* D0 \' K# a+ b. Q: v
$db_user = "root"; //your mysql database username- g, Q  |+ b+ k& s2 K8 H, t
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name0 {4 p; m. y, i- ^& K
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();5 A+ b0 b) o# e: D" c3 f7 J
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;! w) M: C4 B% l+ a
?>连接mysql2 _& p% g1 x; @" ^) m! y. g( h
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。1 k* @0 I: `: F# p7 u; Z$ z4 `
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, $db_user);查询数据库的代码：4 X6 J) C0 V$ }! E
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']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。
if(!($insert)) {' M- r! [: z: q# Y7 V2 g
print "Useronline Insert Failed > ";, B( `) T! J0 ]( w! J. F' X
}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<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {
print "Useronline Delete Failed > ";2 T. `, d% S; V. f
}下面我们解决数据库中不同IP的问题. k5 O3 l' c# r7 t  G
$result = mysql_db_query($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。
$user = mysql_num_rows($result);最后关闭数据库。& u5 e  @) ~" Y
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");/ [( `- U" ]5 Z1 e$ m! W
} else {( h4 ]& x8 ]- Y# ^
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。7 {" u. ?. ?1 g* l7 E
<?php
//Put your basic server info here
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username* e! j  }2 N* M4 L
$db_pass = "password"; //your MySQL database password. O$ J, R' n& n( b
$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 last
// $timeoutseconds seconds)+ i! r4 J# }9 ?+ |
//this is where PHP gets the time
$timestamp = time();+ Q" l  }& D- K
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed. w. o1 p! n* _1 e% d4 Q
$timeout = $timestamp-$timeoutseconds;3 c& S2 N7 T+ R
//connect to database
mysql_connect($server, $db_user);1 Y# [0 p$ Y7 c5 P1 |8 l
//add the timestamp from the user to the online list) N1 I+ }* B$ n2 M
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";
}. t- H6 J9 d& Z& ^
//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)) {8 d9 [6 E+ J  ^- X/ c/ Y5 |
print "Useronline Delete Failed > ";$ Z" E, N7 V9 B4 Y" ?
}
//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 > ";
}/ r0 q8 a0 x: Y4 h% W- B
//Count the number of rows = the number of people online$ t% n" ]. G- w
$user = mysql_num_rows($result);
//spit out the results
mysql_close();8 ]$ p0 u/ @! W
if($user == 1) {
print("1 user online\n");
} else {' h" v7 n1 J" o6 K, a% V
print("$user users online\n");
}$ r! D" C6 C1 \- O$ ^. I" O& b
?>

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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。
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。$ |* I" ~ o% Q+ v! S( ^
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. [! P4 N/ E: Z0 g5 _, G) e
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: C, U Q/ Z- D3 b) X
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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