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！% L& k3 ?* ^2 K; z; V0 ~
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。9 |. k; \1 c. g  e; U
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL( l1 x0 A- M6 {, S2 G- S
}可以使用的SQL语句。
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,$ c$ E/ e/ r. f5 I$ ]
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),4 Q: V6 c4 p! N
KEY ip (ip),7 S% d, Y( v- ?$ }" H9 E- g
KEY file (file)9 o0 j) U; F. P% b
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器/ R8 Q1 Q2 X0 W" v
$db_user = "root"; //你的mysql的用户名* B# G) {- g# F3 ]' |. y
$db_pass = "password"; //你的mysql的密码7 Y' f4 S5 }& H
$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：. ^/ v0 }5 W8 O8 h; ~# }9 T
<?php
$server = "localhost"; //your server, X* D& @2 ?  O  \2 F
$db_user = "root"; //your mysql database username; P0 M# ^5 P1 {  f9 K0 h9 q7 k3 K" T  q
$db_pass = "password"; //your mysql database password if any, \' t% V' X+ I' h1 T; H+ {; Y0 i
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit) H; ^! b( s& X1 @& g2 w
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;
?>连接mysql$ H# x+ n0 ^3 X% F+ N
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。' H+ h1 a5 }" H' W
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：9 S; Q0 f( V# k" C% K% G  [
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']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。8 l0 g$ n2 h5 a
if(!($insert)) {
print "Useronline Insert Failed > ";# X/ F- C" @- A* o% g: e
}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<$timeout");同样给出删除记录出错的处理。, K. N+ d$ M2 v, x3 h
if(!($delete)) {
print "Useronline Delete Failed > ";( T" ~  Q& g2 K7 u, I
}下面我们解决数据库中不同IP的问题/ b( K) v: f2 x+ 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。
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。
if($user == 1) {* M/ _  z. T9 D8 h/ w! o
print("1 user online\n");# b- z; i% |" `- z! H
} else {- d- n) i, P# s% R0 `+ l, |7 `
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。) F  ^, ~5 e% D% O& W) s+ A/ |
<?php. s) ^5 U+ ^8 S$ e6 W9 ^$ @! k
//Put your basic server info here% L, ?/ z! I7 z5 v) y1 [  j( w
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password$ l: u5 d* f+ o' ]# O! e
$database = "users";9 Z/ U& s6 h' {5 i* x* G% s- U
$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 last2 u1 b# V+ v: R' _
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();4 `) Z4 k* f% g
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed7 \/ v9 P0 e/ E, u1 j$ k/ }
$timeout = $timestamp-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list% Q. `& j  Z$ v! ^0 u5 m
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES( M* N8 Q* ?; M3 _6 F
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {) i0 q9 Q4 a* }0 V$ |- T8 B5 r
print "Useronline Insert Failed > ";
}* v! g) S. V( t# J: y- H1 Q7 i
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");7 v# [+ `6 u0 s! h) k: h
if(!($delete)) {
print "Useronline Delete Failed > ";! k; p' k# i# _: E8 @
}
//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='".$_SERVER['PHP_SELF']."' ");+ L( V3 \- H+ F
if(!($result)) {
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results
mysql_close();# ^/ y7 M4 V" D' m7 T
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}
?>2 [7 ?7 v! x# o# u3 h1 U: e3 r

6 T$ t1 x7 p, g; ]3 l% G1 [
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。# P$ t2 [' [3 S( J) M$ \$ W
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。; u$ g8 y* u2 T3 d
当然啦，这两款主机也是相当不错的。9 l0 }' g: t: Y5 s) T q
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/ P. {- I9 m) a! U$ g9 o
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! ], s* B& ~' W5 f) o
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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