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" q9 `  X5 l. Y, t
首先我创建MYSQL数据库表。3 ~3 }+ G& c, a$ a0 l) [
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。/ f, O$ d, ]% h3 F) n
CREATE TABLE useronline (4 ?$ b' w/ p$ a) k0 j, M) g
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,( J4 Z" {- V" ~; @/ Z% L
PRIMARY KEY (timestamp),- j3 ^- ^4 C3 h; q* Q9 l! k
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。9 X6 S$ c  M% s
$server = "localhost"; //你的服务器  P' j3 d: ~- x9 @8 U
$db_user = "root"; //你的mysql的用户名
$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)# `1 n, ^) D0 s' P5 e+ a* A1 a
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server: e8 `2 S* X/ u# g5 u. d5 t4 L8 J/ R0 H
$db_user = "root"; //your mysql database username1 u- O# i- J: t8 w+ K, ~
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name* U) I0 l8 h3 ~; O+ {
$timeoutseconds = 300;//timeoutseconds limit
//get the current time0 s( ?  m3 `* Z, v
$timestamp = time();
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;
?>连接mysql9 Y) L1 ~# k& \! R: B8 e. M9 _
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：! E+ u+ E* s- c
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。8 N& y' Z. a' c* N, ?; m6 f# t
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES) k$ z# m1 F. `( f- S+ U/ b1 O
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");# z6 b. s- h: t  |
如果用户用错误信息的话，这样处理。
if(!($insert)) {
print "Useronline Insert Failed > ";' B6 \7 B% w; ^
}然后实现当超过设置的时间就删除该用户记录。# \# S# v. \6 M
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {# ~/ y) ?) u# H
print "Useronline Delete Failed > ";4 Q8 i) s/ W$ Y9 h& t
}下面我们解决数据库中不同IP的问题& B' Q. Z0 }( c, T* H2 |& C6 M
$result = mysql_db_query($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。# {. C1 l9 m% W
$user = mysql_num_rows($result);最后关闭数据库。  Y, ]* _* v, G) ^, f
mysql_close();显示在线的人数。1 N  y$ v! l3 c" v* n1 s) x
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。( a$ ~# x6 l! ?3 T5 c6 ?
<?php; i* [% I3 `; b" r, N1 [" u) ]1 V
//Put your basic server info here
$server = "localhost"; //normally localhost5 t9 s% b: S- |+ g8 ~
$db_user = "root"; //your MySQL database username: }$ L2 ~" e: g  E. s
$db_pass = "password"; //your MySQL database password3 I, G/ k6 S$ z- {, M0 |
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are. A3 P5 Z; Q+ h" z* Z
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last' c' ]) K1 l2 d) E
// $timeoutseconds seconds)4 u, x4 m; {9 M9 E3 f+ \
//this is where PHP gets the time$ C4 k% N; i$ J; N
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed4 C/ ?- j( |. b  S3 A$ p! B2 [
$timeout = $timestamp-$timeoutseconds;
//connect to database3 a1 P1 _" D( S/ f; U6 n
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list$ L9 C" G  O- |4 K5 v4 I3 C3 q7 x
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES; o7 X! B) V# W8 U  K( h5 r
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");% ]) C. W: x2 _4 p, l
if(!($insert)) {
print "Useronline Insert Failed > ";0 p3 D! E4 j  t) b. ]
}
//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)) {
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page( C# d/ u3 a4 H6 c
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {
print "Useronline Select Error > ";4 w, Y( ?% O2 k: u
}8 B7 _1 X5 L; g( T  _) y7 |( T
//Count the number of rows = the number of people online6 n5 A  c: w# {) E
$user = mysql_num_rows($result);
//spit out the results  [& z  A' f9 T! `' I
mysql_close();% t& d- x) r, \6 F5 Q+ Y; ~: s
if($user == 1) {0 ]( m" S( W4 T. Z4 C% V! x
print("1 user online\n");" _% k0 i- J9 c
} else {
print("$user users online\n");
}
?>

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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。1 d4 T: o; x$ s2 `
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。! b3 t* p" D. y6 Y; G, u$ ]
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; Q7 c( @8 X' u& o/ U2 ^
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2 n6 R: C, `+ z6 M. B2 l
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ ! _8 H0 v) U9 [5 M4 E) M. F
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# Q# y; D+ R. p6 v" i% F/ p
自己加QQ去问吧。

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