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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！&U*|9] q?k:mV3^;{3G
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。-I` ~/{K,LRr
首先我创建MYSQL数据库表。
!cgs:D3v CREATE TABLE tablename (w]4J~(}9co]
field type(max_length) DEFAULT 'default_value' (NOT) NULL
`*fB$cKo2viM }可以使用的SQL语句。
!bY(Aq(m'c nDD CREATE TABLE useronline (}!r8L9`q.Gh
timestamp int(15) DEFAULT '0' NOT NULL,.K.v+c x2VCx'@%LuI
ip varchar(40) NOT NULL,
8NX(ut;e;_1Y file varchar(100) NOT NULL,
]"T(zQ`Z"S PRIMARY KEY (timestamp),
-@ sRq$R Ig4v:dw KEY ip (ip), l4g7NJi,W-\ kt
KEY file (file)
Y0z_(p,{:{%N^ u );下面我们是PHP脚本，首先我定义MYSQL的信息。
w"TcOw]+t8u $server = "localhost"; //你的服务器
|#E.Mr7X ?)c*B.l)Me3~8k $db_user = "root"; //你的mysql的用户名Al W5A"w
$db_pass = "password"; //你的mysql的密码
{ I|s2R(r }}
I;z $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)n:A(B6b9@kc
$timeoutseconds = 300;取当前时间。8t/W?J3qQ,O&h
$timestamp = time();上面的完整代码：?%A:c"q-y+[kn
<?php7aX5c8r6mq~ L
$server = "localhost"; //your server
\8w0Wu sq-S%x $db_user = "root"; //your mysql database usernamepH ovDE+D
$db_pass = "password"; //your mysql database password if any
.X%q3xcJ/C $database = "users"; //the db name
x+|U y.m'ni z*Sh
B0l $timeoutseconds = 300;//timeoutseconds limit
f!?_3d%DqHt //get the current time
]F2K7X{p $timestamp = time();o$b F)IT
//calculate the lowest timestamp allowedi+Zl%P8?-T!Z ~KN1x
$timeout = $timestamp-$timeoutseconds;
{ n{5H'J1l"s ?>连接mysql'h;P)P|keYVs
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。l2MP4JU4o3e,f0P
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
2n VpXUE#vE mysql_connect($server, $db_user);查询数据库的代码：t ddc6ZA]-`cQws
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
,h\
M&sx8N)} $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
ai1t(ky?d6J|&T ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");;~'kj#@%c tq
如果用户用错误信息的话，这样处理。
MZ7A7K
KiA9U if(!($insert)) {
3W O9^+z+X$q'l Mp print "Useronline Insert Failed > ";

o"F6HIu^ X,G S+X }然后实现当超过设置的时间就删除该用户记录。
N_ b0H"aR"|*] $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
i7ur7gcZF$dJ if(!($delete)) {d(f8q(sOK)f
print "Useronline Delete Failed > ";QW3\5U m k
}下面我们解决数据库中不同IP的问题
4pP!ZD(n"Px
d-C $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用 Y2}6Sg&O
mysql_num_rows(query);来统计用户，代码如下。
Z sZ-R*Cn*R[G $user = mysql_num_rows($result);最后关闭数据库。
Gbz5LD
k mysql_close();显示在线的人数。4K
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if($user == 1) {
S K%b"Ey9] print("1 user online\n");K&m ~$~}-GL*r
} else {
kK z;qJ5[1S6o%r print("$user users online\n");
G
x9g{qb }最终把上面代码写成一个PHP文件如下。
3n%e!N8u3~8q+R <?phph)E/n$R||9H
//Put your basic server info here
-HT R6vM@#g}Y e4Z,E $server = "localhost"; //normally localhostuxPJ)WX
$db_user = "root"; //your MySQL database username
i&PUa8o} $db_pass = "password"; //your MySQL database passworda Pz&xoC
$database = "users";
6O%RKz8AuSH0va$y $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
ahz,uwF%c:Z // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the lastL&uEP(jMa-q
// $timeoutseconds seconds))n]eSg
t? ikx
//this is where PHP gets the timeh^l['Y
$timestamp = time();,S+a]9]?eDv1m{
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed*uOq8u:EY*`!A_iB
$timeout = $timestamp-$timeoutseconds;
*?*Uc?t)q^ //connect to databaseI$@zj }?Z@
mysql_connect($server, $db_user);
6@P8r;EJ,k/[+C+L"S //add the timestamp from the user to the online list4q2Hb!l3D!j8DY|;p)O
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES{dh'D:N`,|R/f
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");\ _z/v0MT2W(s8k
if(!($insert)) {$pUSSqpAy
print "Useronline Insert Failed > ";)Yn@xJ
}
?TfD:k;q w5dP //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.(b!R L'Q)}
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
R4q5Fr.yOTfg/`r if(!($delete)) {
5^OECPf print "Useronline Delete Failed > "; |t] odQg
}
[
Q
i#jn#j //select the amount of people online, all uniques, which are online on THIS page
\7Ax)s6A6_7f+y'l $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");{+dok/D#w
if(!($result)) {Lrste O1R ?
print "Useronline Select Error > ";
U!Xz3iA.b
}%rU0f:G)qE P
//Count the number of rows = the number of people online
G,j"mApd(? $user = mysql_num_rows($result);
&jc1UMh //spit out the results
q2u _'Of$|l9W mysql_close();
2S%Bp`}`-K7@S if($user == 1) {m#{ kS&h1DE|
print("1 user online\n");)F%J1uj9v
} else {$O)v'D'~aXn\
print("$user users online\n");Lw B` VE]2e
}
i |ab di;S ?>
G'ep+}T8H [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]E/Zd0}"Y
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。
,]m!u1r5O&r'N 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。
i-?$|\;M8hQWMA 我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。-V eJ"Le
当然啦，这两款主机也是相当不错的。
s-Yi1m+j0}-J&E%MpU_ 智强商务B型：Unix /Linux 操作系统+独立网页空间1000MB+送1000MB邮局空间+100MB MySQL数据库空间=1869元/年
L&s8u4t {He:@ 标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年ddz;\4[-Y{
P$XF3M
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]
7iv$]-XG6T6B t 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]
}2^"h"_~(w"`&c*} 自己加QQ去问吧。

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