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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！|0]h$K+}P
我是用PHP+MYSQL来写的，原理：网站在线人数的程序代码+后台有MYSQL数据库支持，可以直接统计出网站当前的在线人数。n
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首先我创建MYSQL数据库表。R#SP5UD"S@2zN
CREATE TABLE tablename (peM?Y&M_q
field type(max_length) DEFAULT 'default_value' (NOT) NULL1CO TXGH$C
}可以使用的SQL语句。
gj'_Zl[C^c%z:N CREATE TABLE useronline (
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o.f!c'H4^/{_5t timestamp int(15) DEFAULT '0' NOT NULL,,R2p4|
Y/I h*x)T
ip varchar(40) NOT NULL,*W
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file varchar(100) NOT NULL, s2X"|M8G4\L
PRIMARY KEY (timestamp),u
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KEY ip (ip),~nf/Mh;M n R
KEY file (file)
ONbxmR );下面我们是PHP脚本，首先我定义MYSQL的信息。c6P*iB5q o:ULR
$server = "localhost"; //你的服务器
)U|1{Af $db_user = "root"; //你的mysql的用户名H%RQV1e \fk
$db_pass = "password"; //你的mysql的密码
%{5c5q2hBkS $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
%dL7Dr't[Rs $timeoutseconds = 300;取当前时间。"s*Hzv,O?+q{&M
$timestamp = time();上面的完整代码：
g9\ m*dnJe <?php
M{;b)Er $server = "localhost"; //your server
fr&YW Tk G $db_user = "root"; //your mysql database username
+hkZi/FW $db_pass = "password"; //your mysql database password if any{#M-T:Yi
$database = "users"; //the db name,bxBWjd&j3a
$timeoutseconds = 300;//timeoutseconds limit
I0gMS6R'r,]"g6i //get the current time
5Dt1AN1lG+F%`1ni $timestamp = time();TJo)]Z]Q7U
//calculate the lowest timestamp allowedL:ZgWxG {
$timeout = $timestamp-$timeoutseconds;C,I[7r{Y
?>连接mysql
P'GK DI*aJA*H mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
7X#FW"s*c:m)` mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
ub n6D?Y.W2J mysql_connect($server, $db_user);查询数据库的代码：X_@pQ m`q
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。.IV.sKo5zi
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES0Ar Y,w%x#F(^1t
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
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[+~ C 如果用户用错误信息的话，这样处理。
!U"Q3WJIN_,n6a if(!($insert)) {
Ze8iWfq print "Useronline Insert Failed > ";AqfH,m
}然后实现当超过设置的时间就删除该用户记录。
0BH)f^;`*Ct $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。D+o;U~mpj@}P'e0_(j
if(!($delete)) {
5E` b/L f'Z print "Useronline Delete Failed > ";
gOnWR/fa%u }下面我们解决数据库中不同IP的问题^\O3L-ju\
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
2I4w/VBTMu2W mysql_num_rows(query);来统计用户，代码如下。 i2o2}%H&D5c L
$user = mysql_num_rows($result);最后关闭数据库。
~7AIS&Hbm mysql_close();显示在线的人数。
g%T6YZ,o|y(ne if($user == 1) {Y6yU!I#N"a"T%D
print("1 user online\n");
j@h0r8lt^7R } else {
,q8z:l?hM9j/] ^.h5K} print("$user users online\n");+Y"c4Iz!wMn^t3u
}最终把上面代码写成一个PHP文件如下。
(?y[1H
f*M <?php~hN [!ssJh8n
//Put your basic server info hered
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$server = "localhost"; //normally localhost
^Z7^(J6})iX,s{ $db_user = "root"; //your MySQL database username$G)~
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$db_pass = "password"; //your MySQL database passwordv4H:ko.xJB$m
$database = "users";A
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$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areUFE_,j l)Z#B
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
pe,m2Z8x:d%zw+@Dh2Hg // $timeoutseconds seconds)
4J P wowL"X //this is where PHP gets the time6Ak2mmchX
$timestamp = time();
|w-b$caU G#Y^oI? //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed u}z+rn/ox
$timeout = $timestamp-$timeoutseconds;qDr]2_"h6kF-I
//connect to database
F-Ger'h mysql_connect($server, $db_user); arG8b-QoL0RY%?*Op
//add the timestamp from the user to the online listC ufk|'^-c
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES'b*_aj5H V
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");9`/YFbU.uA%O
if(!($insert)) {
OW7@1CI1B _;NN'Ja,c print "Useronline Insert Failed > ";
#R'@rn`#] }
7C(`:c k%Yyn`e //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
1J|0] XK&gNKi-JR $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");|J1H(bW!w+JBo[u
if(!($delete)) {
3H`7LI3x)Cd"Y.wx*r,Q print "Useronline Delete Failed > ";$sm tWy M%b
}_$J%UxcE
//select the amount of people online, all uniques, which are online on THIS page
v,XS_e $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");,u{7?)Q9`j9H&p4A(S4H
if(!($result)) {d*{;^7JMq'[
print "Useronline Select Error > ";$di/|.iu DoC/_
}
x$s4kT6?t @_
t //Count the number of rows = the number of people onlinef?%k5t$~7tb
$user = mysql_num_rows($result);
e~J;y1t K5n$c2s //spit out the results_,gX:kC2cT:kj
mysql_close(); Y6k
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if($user == 1) {
)f p9q-Ms1g~ print("1 user online\n");&q&lq&po.\
} else {
W/x ?3iO-P w print("$user users online\n");
a:Czx#~ }
X9[7Q6R*fZ y @f ?>
V?2oTo;F @
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8`7]+\mP 以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
i)p-F0lT'c:X 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。
VAs,HH%_ 我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。
)C+o%|:qd 当然啦，这两款主机也是相当不错的。
T!ck-R`2\G 智强商务B型：Unix /Linux 操作系统+独立网页空间1000MB+送1000MB邮局空间+100MB MySQL数据库空间=1869元/年N$e(N'B[%eY)s
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
-g5x0XTjW*@4h 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]
yS"a.PzcLi_ g 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]fPe+B
sNc#b
自己加QQ去问吧。

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