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lilcy88 发表于 2008-5-28 10:40

刚用PHP写了一个网站在线人数的程序，请大家进来指点下！

刚用PHP写了一个网站在线人数的程序，请大家进来指点下！'z9D6X;~A}z
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。|0K8T)_JZE w
首先我创建MYSQL数据库表。
QbwHY _ V CREATE TABLE tablename (
Oz$spuQN+^ field type(max_length) DEFAULT 'default_value' (NOT) NULL
;N2T*I3? Q }可以使用的SQL语句。
|2Zm xy'I"J CREATE TABLE useronline (
`oEF7C q2MS4J timestamp int(15) DEFAULT '0' NOT NULL,sPE$@2Sc ]F
ip varchar(40) NOT NULL,'SnrN'bo
file varchar(100) NOT NULL,
%CIT%`g PRIMARY KEY (timestamp),g*XhW/rq^
KEY ip (ip),:W
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Quc:X8K#r
KEY file (file)
1oB9F7j)Qh1^;hj );下面我们是PHP脚本，首先我定义MYSQL的信息。S@&{8U3Rk%e@~'H
$server = "localhost"; //你的服务器%AJ]7nv2hNI7m'T T
$db_user = "root"; //你的mysql的用户名;f)B2DJ#zE
$db_pass = "password"; //你的mysql的密码
6Xsh$D*y)xQ9Z-JiW)T $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
o(d ?~9}0J`!ry $timeoutseconds = 300;取当前时间。 P(f7~6h5E H \r1F
$timestamp = time();上面的完整代码：1MS/[3U-q/AwF} E
<?php
2BBRo#JZQ0mH:] $server = "localhost"; //your server
.c gN9}T"}'x,nJ0`7C $db_user = "root"; //your mysql database usernameH!C6IL#rC,U
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$db_pass = "password"; //your mysql database password if any2U Ho4th
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$database = "users"; //the db name
&bN5am*d1Dk0D $timeoutseconds = 300;//timeoutseconds limit Zc&s2d!~
//get the current time
v9RG;^H $timestamp = time();
yQuJ)I'~?"m //calculate the lowest timestamp allowed
G-d"b%t7{ $timeout = $timestamp-$timeoutseconds;
$CCHD/yjj d P)c ?>连接mysql
^3]*t Ve7K mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
kt5A YE*LS mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接zZc
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mysql_connect($server, $db_user);查询数据库的代码：
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mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
2{0uM D0_4T3I $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
P2GKEs,wFo6Ee ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");(uNM2~Vq(}4C
如果用户用错误信息的话，这样处理。
f:OKMz]5H1X h5Y if(!($insert)) {|tOF5D
print "Useronline Insert Failed > ";
&]3q;O!n6~#jkS }然后实现当超过设置的时间就删除该用户记录。
6]'l9P1Cmh+VW $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
-]N6J/RdV*YlQ if(!($delete)) {'Y;?]XXH%n:j
print "Useronline Delete Failed > ";$@9zRO[&ss
}下面我们解决数据库中不同IP的问题W&AjsAT lb
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
K:o8iE7v5^X1e9A mysql_num_rows(query);来统计用户，代码如下。
E&q7hE Z;Ie rcR $user = mysql_num_rows($result);最后关闭数据库。V)ae ri
mysql_close();显示在线的人数。
*gt#J@Uc&Rv if($user == 1) {
{@dH aO(Q6y print("1 user online\n");8lH,W;]6Rz:B
} else {p$F6nn4Qe1f*`S i
print("$user users online\n");go2u#Bx
}最终把上面代码写成一个PHP文件如下。5U/g6Q;b0Ll!`
<?php8G2zNri(px
//Put your basic server info hereeyvB6G(}!a}r
$server = "localhost"; //normally localhost
5S4^-J"E6]9~Vy $db_user = "root"; //your MySQL database username
+O\xc7h~ E $db_pass = "password"; //your MySQL database password
c~:@#] vKwF $database = "users";v,p0i\W ^c
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably arevI,m%i V%AQd L
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
j1IY&m;y // $timeoutseconds seconds) ^u
A.H/D,`%gs
//this is where PHP gets the timep7t `YEwg'zS
$timestamp = time();
4D"}{:ga:Qt //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed(~,_bU|
$timeout = $timestamp-$timeoutseconds;
8s,H7BgA6q] //connect to database
4`@5v%?5x1oc mysql_connect($server, $db_user);8T2{ Er!K+S
//add the timestamp from the user to the online list/sY?"O/zBJ
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES$U D&M#ju8Q[
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
$r!h9Eu"X7e if(!($insert)) {Q?@8n?W
print "Useronline Insert Failed > ";
#m/g9x\U }
Y%|P jeH //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
nx+Q(d#N#B:\ $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
o(`(d/KV1s DS if(!($delete)) {
b1c3Oh`Y"Ae print "Useronline Delete Failed > ";neU [R`s%`y D'T}:x
}$X'WpAu [
//select the amount of people online, all uniques, which are online on THIS page
:w.IJ+Z^ln $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");:v"]qv5U l G#vn
if(!($result)) {
-MAD|N'zuS print "Useronline Select Error > ";
!pO9yvPi }
w5[%F/p"R9v:hAF4?R //Count the number of rows = the number of people online
^%J
Ff6G&|x $user = mysql_num_rows($result);E3k:Kf)f,[,^
//spit out the results
*ed{$BA#A mysql_close();
EP Z+^1n l/c if($user == 1) {
e"{IT3g Ao(A print("1 user online\n");1j,MI'N,K ZC
} else {
y\K0|&{!B? print("$user users online\n");}bWn$[
}.\#~x2YS*b.G-n
?>ABhrb
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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。\ aD-x2o1k|@
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。
3oq6p-~?
uW 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。
8f!o0Sa9qY 当然啦，这两款主机也是相当不错的。
]| L;z#ur5T6W[ 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
Ba[5lPsD o]p 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
+f2pnM#Q 提供一下这个公司的联系方式：请见：[url=http://www.now.cn/vhost/]http://www.now.cn/vhost/[/url]
/Dfg6tc'Ik$H+rI0} 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 [url=http://www.now.cn/callcenter/call.net?LineName=55]http://www.now.cn/callcenter/call.net?LineName=55[/url]+@h^#o H__0}u
自己加QQ去问吧。

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