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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！4KT&ao%|
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。(~F4ulA vk9K&e
首先我创建MYSQL数据库表。
Oi/AOzW@`]a? CREATE TABLE tablename (
cb(cU |-B field type(max_length) DEFAULT 'default_value' (NOT) NULL
;n+P/nl|Qgm }可以使用的SQL语句。'Ks/Gnc`A a&E/J
CREATE TABLE useronline (
#kBa.ap,JD*pH timestamp int(15) DEFAULT '0' NOT NULL,@G#Y1\O:n R
ip varchar(40) NOT NULL,
SV'i:sX%|P#f&a file varchar(100) NOT NULL,t1w.t3LF#A-UW
PRIMARY KEY (timestamp),'zYb~}{Y
KEY ip (ip),o'T+e@-H0l x9tv-`
KEY file (file)
;d"mDI.DW );下面我们是PHP脚本，首先我定义MYSQL的信息。+G8e'lE[)X7W6i,m(Jk
$server = "localhost"; //你的服务器9y,`AZzf7B8S
$db_user = "root"; //你的mysql的用户名
A4pD*U)zOjk$E $db_pass = "password"; //你的mysql的密码 rff%J,a1Y.G%t `!B
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
%Zg:}2e`g;g $timeoutseconds = 300;取当前时间。:CqP2~#d
$timestamp = time();上面的完整代码：
"R D4dj7[H*c,| <?php
1N0LP$X&duK,E7oy $server = "localhost"; //your server
8_K^_(~H$U"? $db_user = "root"; //your mysql database username
)ww5lt)^] $db_pass = "password"; //your mysql database password if any
1x/r^+o'k8I8f XzZ $database = "users"; //the db name
a(L eI)kLr{[e $timeoutseconds = 300;//timeoutseconds limit
,R.YW-Fh_${Y@ //get the current time
5[a(~d-kgb Y $timestamp = time();
4?5XBxq //calculate the lowest timestamp allowed{2^'{S%h}jGWBu
$timeout = $timestamp-$timeoutseconds;I"O/xVri~7PIA7x
?>连接mysql
I6C3c!{N}F"P mysql_connect('localhost', 'username', 'password');也允许使用变量形式。T[;qTE)^G
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
loiF[wv5O'i mysql_connect($server, $db_user);查询数据库的代码：?~.ySv@C3P(Q
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。V!eTc%cW/Q{
k
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESyy%sl!uj Pw.A
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");#\Q5n6oUKZT(z
如果用户用错误信息的话，这样处理。
g*t[M3G.GM if(!($insert)) {
s6[qyT"Je print "Useronline Insert Failed > ";$n2w6M'A%_ S%@4o
}然后实现当超过设置的时间就删除该用户记录。+}gs+d@BY&W
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
v W:CR,_7S8k.c~e3d if(!($delete)) {)LWbE#Z'rM
print "Useronline Delete Failed > ";cr@H.n?;o
}下面我们解决数据库中不同IP的问题
sR(kq#@6e$VN(z8s;^!P $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用yk[&?r Gx&Ti
mysql_num_rows(query);来统计用户，代码如下。
-Nm(B r
q $user = mysql_num_rows($result);最后关闭数据库。%H H1Zd7`%{1C
mysql_close();显示在线的人数。
*R;Jos/f(`%OZ if($user == 1) {
q2|8q6`Ad+A.Q Rh print("1 user online\n");U`dRB
} else {n0? ]j [.^/Oht
print("$user users online\n");
Uf
[^r1Rx5o }最终把上面代码写成一个PHP文件如下。6}0f8N\1D
<?php
+|Au?J9KX //Put your basic server info here
O'x1I~u/~ $server = "localhost"; //normally localhost+J~o1_SO?@+Q8`t
$db_user = "root"; //your MySQL database usernameT/Q])P4PM,B+E
$db_pass = "password"; //your MySQL database password*B!Q
w5z P
$database = "users";\]&zq1V:h0p
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
K*i`|] // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
e9a)c:s8?;_}7a // $timeoutseconds seconds),X3w s1PK7gI
//this is where PHP gets the time
s`|U/d-l%m v[-h $timestamp = time();
7lFJ?*[ Q$v#V"]y //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
`d-Nd!T e$t'M5qu $timeout = $timestamp-$timeoutseconds;.iRYJB?
//connect to database*qj |0aG'r)E B
mysql_connect($server, $db_user);4];}#UDrf
//add the timestamp from the user to the online list)?D2]FN-m-z
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
6yRuD_#g ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");6E0rNHM-H[E-j \
if(!($insert)) {2u0d"{l2[ pZ6l/X
print "Useronline Insert Failed > ";H(\lY U7o/S(e
}
k J-TFjl"D%] [ //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
5`?4Xde!{ $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
jxa&DDc;R+G if(!($delete)) {
.jM8E9U Q ?kX print "Useronline Delete Failed > ";E{/D5Tu4Lhg
}
^ [t?8S9o //select the amount of people online, all uniques, which are online on THIS page
_?~#m)BI $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
(I6S+B[b?;^ b^ if(!($result)) {9A,C/^+jJ
H,\p
print "Useronline Select Error > ";
,v)\(B|+ga~
_F }
_E#a6y0`v!f //Count the number of rows = the number of people onlineq8j D!Z.W2wzn1dg
$user = mysql_num_rows($result);
xO(l3q.n //spit out the results i6}0T%V$Y
mysql_close();&@ru1fZ[/w@!]
if($user == 1) {
2t@-V2O,G0R1m8| print("1 user online\n");
Ha*nm(S!`ls4G&I } else {
}q*x|)p#^g print("$user users online\n");SC lmT Ru8w
}H5[
vm.It4_ T
?>I5|X.x5{
[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]$T1`c^{.q1C!z6_ O
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。!Y-H;\Slx}`
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。
/K)k"ld5P-N~ 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。
N-M.|j)E`?[-y/h 当然啦，这两款主机也是相当不错的。 }x^yl3\4d
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
)J Mz,dOxX0HWA|E 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
nB0Op%GG 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]
*F3We U'Ux+})WlJ 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]V/[x:Q dsL/Q]
I
自己加QQ去问吧。

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