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！% a- E: Q# c* o) U* W
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。
首先我创建MYSQL数据库表。* N7 ^+ k# R" Z- D7 P" O8 O1 X4 M
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL. e1 Y* J1 [% J  }0 r3 O" F' ?! s7 K
}可以使用的SQL语句。
CREATE TABLE useronline (6 E- j! w3 t" x. K% S% x
timestamp int(15) DEFAULT '0' NOT NULL," c: s) a! S) L
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),4 y& y0 ^: e, u8 C3 L9 H
KEY ip (ip),
KEY file (file); }7 N- g6 |# v5 A/ \. l
);下面我们是PHP脚本，首先我定义MYSQL的信息。* S$ H4 s) [/ d% A2 \
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名% a6 H/ Y8 G( S7 P* d
$db_pass = "password"; //你的mysql的密码3 G& D9 j/ @5 L+ ^8 v; w6 a
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)" u: ?: ^' d8 g
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?php1 ~0 E5 V5 \$ v2 Y9 e: B% G: X
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any4 u; E/ P9 }2 s% y; {
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit/ t( p6 D; Q- i7 X- |/ P5 X
//get the current time
$timestamp = time();8 q. \& _# c0 Q1 l* Q
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;) _6 o( M$ E2 \) z: }
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。- I$ {; C: e0 N7 O) O
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接4 m, y9 u" l! e' Z3 v6 e
mysql_connect($server, $db_user);查询数据库的代码：, L" j6 R+ H) d0 x% Z/ b
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- `  G$ y$ }9 v7 v9 L2 O+ }  W, b
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");+ j# J6 i! p' l' S
如果用户用错误信息的话，这样处理。. L: y" G4 [. n9 ~0 Y2 `
if(!($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。4 S  B, ~& n( W( f. {7 x. ~
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。! v* _. B) l3 W% ^' `6 K
if(!($delete)) {
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题! p( @9 b) E9 s1 [- P, i1 o7 I
$result = mysql_db_query($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。% R5 k/ T5 `+ O# z2 y0 z
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");( O, L1 A/ w* z7 g
} else {5 t0 ]( ^# G) Z4 P% s+ J
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。
<?php8 S2 Z( m) x5 j- ^
//Put your basic server info here, I8 i0 b- T5 t+ X( @
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username7 t" n# H- E8 C
$db_pass = "password"; //your MySQL database password5 ?8 h5 \) j, K  E. F5 i4 S/ d# s' z
$database = "users";' u# C% Q) s/ `; O" X1 c& C5 G' J
$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
// $timeoutseconds seconds)
//this is where PHP gets the time% s: p/ S( |! e9 h' S$ |5 I& Q
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed& V. m2 N/ e* O  I# i3 d
$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']."','".$_SERVER['PHP_SELF']."')");4 R( h$ W' w+ }. X+ w/ y. z& _
if(!($insert)) {; h. k! p' Z" P. O* t8 ]$ @
print "Useronline Insert Failed > ";6 e. U+ h- ^, R4 F- ]) K' D+ }  Q
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");4 n; O7 B) f9 o9 {" x
if(!($delete)) {
print "Useronline Delete Failed > ";5 r0 H2 V% A. o* m$ u0 l8 L
}
//select the amount of people online, all uniques, which are online on THIS page0 ]9 b( ^" Y, j! l: I  a5 B% b
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {
print "Useronline Select Error > ";7 ^: A0 o( H- X6 m1 `0 m" i, z
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);- G8 }4 n/ \; v' b8 B5 X
//spit out the results" ]6 {8 A3 i+ P* f& k
mysql_close();# F7 U  t0 A9 D4 ^$ t
if($user == 1) {
print("1 user online\n");6 F7 f. o- D  w1 f
} else {- ^4 m& y6 e: g0 ]1 M  _
print("$user users online\n");
}) ^3 o& e  y8 c' @" m  g
?>4 G8 G$ v  a7 D. P3 m

( h4 Y  E0 c' D' K6 D( m: D$ F+ [
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。* U5 f" O  L- A# x5 Y3 j
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。3 z; A! S. c7 X4 G; [. Z1 D# h- u+ @
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。* }$ j: y0 D. F* O1 f6 u; R$ O9 `- X5 `
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" I8 f6 G2 n8 N, a; |8 t0 F
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=550 N# l  B( C, h' H1 L$ |! S; ^
自己加QQ去问吧。

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