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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！
r]yu%u)cP7FG 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。 S$m(M#^m)[
首先我创建MYSQL数据库表。
IU M"m7SZ] CREATE TABLE tablename (en[&Ug5}!O
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field type(max_length) DEFAULT 'default_value' (NOT) NULL
jnw"dND{ }可以使用的SQL语句。B K3G:bJP3{8]Y
CREATE TABLE useronline (j'iL9a1m6{c&m
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timestamp int(15) DEFAULT '0' NOT NULL,7SFCW+N+M.i_+HJ
ip varchar(40) NOT NULL,

xW` u5IOjW file varchar(100) NOT NULL,
lJA[8X PRIMARY KEY (timestamp),
+h+[_*p-n-D KEY ip (ip),cHS9?9j'|3pR&F
KEY file (file)
9K(A _"I{#U );下面我们是PHP脚本，首先我定义MYSQL的信息。
z:[V4X.T:lr $server = "localhost"; //你的服务器
9I)\ sp'b8gA5s $db_user = "root"; //你的mysql的用户名q:[HL7e4y K L
$db_pass = "password"; //你的mysql的密码`g`~7R
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
d%C^'QF|x#Q a-R $timeoutseconds = 300;取当前时间。
1sC;['DnD $timestamp = time();上面的完整代码：
$V_R-~(G+n PK/P <?php
!WBd2kC1b $server = "localhost"; //your server
-SU"_9z4w,Ma^h@)f $db_user = "root"; //your mysql database username
%LzN*^B#U0?~ $db_pass = "password"; //your mysql database password if any
n,H}D\w Fk $database = "users"; //the db name%~qJ9M"H
$timeoutseconds = 300;//timeoutseconds limit0s%U7LnaoY"W]!i
//get the current time
{iU'Mxp-|8s6s $timestamp = time();F"w/nS _ e
//calculate the lowest timestamp allowed
.U'Jk/?{7E $timeout = $timestamp-$timeoutseconds;E^@0a._:B9w
?>连接mysql[qw
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mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
Ar!j5_Xl mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
1_["c8T g_s mysql_connect($server, $db_user);查询数据库的代码：

p'G\l/~ yJ o^ mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
*xiH!G!PRq
G6g $insert = mysql_db_query($database, "INSERT INTO useronline VALUES2jtQQ{Gfqz*K0T
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
%C"m$l4RKh)bE 如果用户用错误信息的话，这样处理。
&d(U:{ ERN7z`L if(!($insert)) {rs mg~x'Fzd
print "Useronline Insert Failed > ";Q/Sv/Ji
}然后实现当超过设置的时间就删除该用户记录。FH#_,ny_%~
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。DlQa sfS
if(!($delete)) {
0P8E ASJpN print "Useronline Delete Failed > ";!k ?#iwki
}下面我们解决数据库中不同IP的问题
m] TCJ*w $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
MdZ"n}? mysql_num_rows(query);来统计用户，代码如下。3~7m\,rhX"Gkn
$user = mysql_num_rows($result);最后关闭数据库。
o,U k'i_ mysql_close();显示在线的人数。"Q$b\Yt/d?4NC
if($user == 1) {8T3}4lw_*f~]z3t
print("1 user online\n");pm
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} else {/O ^Z0Ad
print("$user users online\n");
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Ex{p0k.U }最终把上面代码写成一个PHP文件如下。
GYK`uH
X <?php@"\7|]+j]
~,r
//Put your basic server info here
kVSY5B $server = "localhost"; //normally localhostrktZ@7j ~Nr
$db_user = "root"; //your MySQL database username
P
t1HO;_i-J^{ $db_pass = "password"; //your MySQL database password
1s6[ i*z-~6A $database = "users";$l+r.bm)V J_1C;pZ0q
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
sF~5QIz U5H // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last%D7aZ3l|/P*t3vK
// $timeoutseconds seconds)2f#wMC.Bz\4hQ%R$V
//this is where PHP gets the time
Z9},V.d T*Usw!P $timestamp = time();
*j'`UM!S$f V] //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed4dE"x%?~Si"g
$timeout = $timestamp-$timeoutseconds;
uy9]!p k3@iuw C //connect to database*[&y5A9E.[([0Z2S(z:uv
mysql_connect($server, $db_user);
+E#o]cUd E //add the timestamp from the user to the online list^8DD7lY ?xt7|!n&\
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
)i:w x z)d
h/gg ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");!w6m CV`5K0gn
if(!($insert)) {
T u+g BX+f6v8hu,z print "Useronline Insert Failed > ";
@&~D|`
SZ }2C$gj!s9i*k[
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.9g7X'l(W*w*w.dJ*D
F
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
8gd(d@9hx9Bl if(!($delete)) {BN.Qa [#mZs5Q
print "Useronline Delete Failed > ";U4gFH-g%n7l!pB
}
%RE TV/{;w2?:?*Gy+a //select the amount of people online, all uniques, which are online on THIS page^2t5gv5P(o
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
6ZWk q(`2B,B!Kv if(!($result)) {
cH$u p x;OhFI-_ print "Useronline Select Error > ";c5`"e)T4s2s
}
DM7~1N;xzV4V4Lz'Z //Count the number of rows = the number of people online
3p!t!~o r!Ui{ $user = mysql_num_rows($result);
&Ym-r;k0s%X1t$a //spit out the results0c^'a H"[1h}
mysql_close();/@(H8HjO
S3r!D+B.X
if($user == 1) {'e;?s:M:P ?
print("1 user online\n");4C![/fb7i
h-\ b'vO
} else {,MM{Y.D$~&C*s
print("$user users online\n");ss!F:]/oq+?6E n
},K/]C9R,Y4Sj
?>b)W'Z;Nm*JS
[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]QV#t{g)v,l4{
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。qz.W)y}2A?(x
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。
tM*K0XBw)X 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。
e-Vz+`:U^8rY 当然啦，这两款主机也是相当不错的。5Sjgd*g
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
;^` ^2X
`Zax$Uz8s%T 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+m!v/Vp5\
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]
Dq]ff,h^ 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]%x
fw6q@)q+?!^/rC
自己加QQ去问吧。

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