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！& \% `, T6 S" R
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。( L3 w! W1 Z, C3 c
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL' Y+ B( E% C4 I$ j- A5 _; P* e7 w
}可以使用的SQL语句。
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,' \7 k/ z2 `0 q7 Z
file varchar(100) NOT NULL,0 T) G2 O' {1 i# M* a
PRIMARY KEY (timestamp),! v# X' T, U- N; f, @2 `% C
KEY ip (ip),$ E# [$ |$ @+ q/ P
KEY file (file)) N. E% R: c+ _3 R) V
);下面我们是PHP脚本，首先我定义MYSQL的信息。4 w5 q3 \  l& I+ ]) y, H# u
$server = "localhost"; //你的服务器/ |9 |1 @4 t2 b  ^9 `2 D9 Z" C# H# u
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码' ~; P( i, w( U% ]! G" r" ]* M
$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
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username; [2 h' u2 p3 p# o
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit% C! A  m. D, R% U+ d
//get the current time  f0 ^3 G( S+ n- `3 m- }
$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。. y! `) z3 d; ~5 q
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接* J/ c9 U5 j% P  j4 W: x' z5 N6 _% B
mysql_connect($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。. J2 h' Z' X7 D( S
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES0 B: `" G( e6 P+ Z, |; b( W+ q
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");* _* q, [1 @6 m  R; h
如果用户用错误信息的话，这样处理。1 j3 o$ n$ |, k0 _2 j
if(!($insert)) {3 N4 K6 i4 L! z; G4 @
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。! x) G' |* G: `' r+ A: c" ^
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。7 M2 \; z/ }# `: n( r2 ~" {
if(!($delete)) {: o- @2 U! t2 l/ r5 @9 m+ e2 P
print "Useronline Delete Failed > ";2 H$ B) _$ k( Z2 i: E/ T  W
}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
mysql_num_rows(query);来统计用户，代码如下。8 A4 y2 o+ O  V7 P
$user = mysql_num_rows($result);最后关闭数据库。/ K" }9 K  G  C% I7 r  D9 i. H4 w  H
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");) I- j( F. H5 m* d* V$ V: S% g- _' b. L
}最终把上面代码写成一个PHP文件如下。
<?php! }+ s( L9 @7 o0 w, N3 f
//Put your basic server info here
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password$ D; t9 q3 {% s8 @% C4 `# {- `
$database = "users";4 y. P8 L: I6 Z9 h: m$ [
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are  r( T# ]& ]2 {# ^+ N! y! K6 n
// 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();5 \! R( b# E0 C0 |! ]
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed# U( o0 n! b/ S+ D! c' U# k
$timeout = $timestamp-$timeoutseconds;
//connect to database' `+ W( B0 m9 j3 ~
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES6 F! x! {2 o8 X8 L6 l
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";  N  D, M; J7 |3 k6 r: x) S
}
//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 > ";5 S( w! P  x+ m# \
}
//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 > ";
}: W- d+ J) X) z! x7 F" N
//Count the number of rows = the number of people online+ `- u) E: p- u% G
$user = mysql_num_rows($result);
//spit out the results
mysql_close();
if($user == 1) {
print("1 user online\n");, X) r* v+ O' H  [" r5 F# N
} else {
print("$user users online\n");' j/ n1 n8 x" x5 N& D# C5 V$ t
}5 X+ M# B3 `$ g5 h  t/ H
?>

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。" \8 t8 X) x' }1 t) _1 ~% }; K
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。4 y4 N# c v& O6 u/ {3 C
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9 G' l$ Y- B" w
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. E& C" p1 D6 U+ p* ?: n% b2 l
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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