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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！lB'g S9gy
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。
:rT0L&jQ+L pf 首先我创建MYSQL数据库表。a m]~ gF lqV
CREATE TABLE tablename (
Te|(gF!`/d;p field type(max_length) DEFAULT 'default_value' (NOT) NULLy? A!Ky/a~
}可以使用的SQL语句。
F&}B?+r CREATE TABLE useronline (2t+D6|1ekv6i#H
timestamp int(15) DEFAULT '0' NOT NULL,
km"BN(q4hz
A ip varchar(40) NOT NULL,D}?M+?jTf
file varchar(100) NOT NULL,s1]'f Fy"o8b
PRIMARY KEY (timestamp),
?~R(N ~N(gk KEY ip (ip), Q'd6zQa.?bKT
KEY file (file)
1MO7ZyCirz\ );下面我们是PHP脚本，首先我定义MYSQL的信息。
9_:hI suD!G $server = "localhost"; //你的服务器 Yup9I/B
$db_user = "root"; //你的mysql的用户名
'InG*Vd&~ s'A $db_pass = "password"; //你的mysql的密码
-^\qy8w $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
n5zN2b.~x;\m $timeoutseconds = 300;取当前时间。
[$w$@c;G!H $timestamp = time();上面的完整代码：M5O2oL_l[[.O
<?php]%j1V.L.{&\l3s3A
$server = "localhost"; //your server
a#wE4H
` $db_user = "root"; //your mysql database username
voOO^,Dv $db_pass = "password"; //your mysql database password if any fl5PN7v#I)_
$database = "users"; //the db namexmuP?"wS
$timeoutseconds = 300;//timeoutseconds limit|(U%bfkO[?
//get the current time"]u6VYW1@){`
$timestamp = time(); ikf E*z/?
//calculate the lowest timestamp allowed
Br4Z6V#oTh/r $timeout = $timestamp-$timeoutseconds;[3Bdj?u)^
?>连接mysql
:qE%d2k.dK\ mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
k6F9G,yTo,` mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
*H2Q
GX*U#j.y@y mysql_connect($server, $db_user);查询数据库的代码： ~U}/cK)R
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。kqhYA7h
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESCqq0h ^|7q~ u!eB
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");:M:G$sf I:d
如果用户用错误信息的话，这样处理。!M9}%L w/D:T(d whd[
if(!($insert)) {
:hyf)N2FmqS$sq#kN print "Useronline Insert Failed > ";W|2h2W`,op
}然后实现当超过设置的时间就删除该用户记录。+[0vZ$v!n1aj
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
8DPq4qH9L+_q if(!($delete)) {
Q
`:wvKZ print "Useronline Delete Failed > ";
1Qu'hC8Z4fU.H }下面我们解决数据库中不同IP的问题
!Y1i(N9}'N.u9Ls $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
R!Uz8m)Ju mysql_num_rows(query);来统计用户，代码如下。
br6@n2F/y1l $user = mysql_num_rows($result);最后关闭数据库。
#rB(w\t1FO mysql_close();显示在线的人数。r ~5hA8h0O)]C
if($user == 1) { Vm-U{/S f(F
print("1 user online\n");QK].S}zi
} else {-Q9P(wS4wz
print("$user users online\n");
B@W-m(EJ s }最终把上面代码写成一个PHP文件如下。
%_ ?m(SNE6@C <?php
1G^)~uXX9n_hg //Put your basic server info here
|cB%V*n/dt{ $server = "localhost"; //normally localhost
[:~!c
AfV"fY1gs9N $db_user = "root"; //your MySQL database username
1Q,fn5c U6S $db_pass = "password"; //your MySQL database passwordo-e
]&@*|(nZ3w
$database = "users";
B#FM-\)E+N $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
i:L2_j3[;Wx] // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
XK&Z2Ee vY~ // $timeoutseconds seconds):nzF!T(i
//this is where PHP gets the time
U_ \(GE4B $timestamp = time();9D3I`ZX
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed8i8[ t Q!a;HL$g,T
$timeout = $timestamp-$timeoutseconds;-E*\IXW;h*G N
//connect to database
\RucGmt'S.K Q mysql_connect($server, $db_user);
8}J%_h;Y[7E G //add the timestamp from the user to the online listv0}Kq7|9w$sg
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES sm4py(ilo
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");e6QI/z:m1Y$vC z$OA
if(!($insert)) {#Jj*WZ+?e
print "Useronline Insert Failed > ";
\ooA"n,vf }I$o%^.RB{5~:w
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.e YC$Ve-]6|Td"u
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
)mi-D2s7^&yR(\ E8q,NW(] if(!($delete)) {
d2cjq$Ah print "Useronline Delete Failed > ";o A,ZE
Gr(W:\
}7Vo6KM;CLb Z
//select the amount of people online, all uniques, which are online on THIS page
*b.Tz,nC,\ [ $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");6}8O5nvR
if(!($result)) {%O.A%d$p"@
print "Useronline Select Error > ";:E)Z7~)V(w2U5d J
}%u f(\/m"B ZW _qw
//Count the number of rows = the number of people online2To)W%b:R1W
$user = mysql_num_rows($result);
w@G4r[3l //spit out the resultsr-}H#n+} N6n
mysql_close();4b#Aa(N-n)O
if($user == 1) {
"Xd2bl'UL G8l"h print("1 user online\n");'Na bZc_duPe
} else {
,V~"MeYI print("$user users online\n");C0c\Q)X BL7ki!Sxu
}
-W.V&{3p
Q-iw ?>
cocG5d&}#i*l [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]I:j#gm#q6v
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。9I5]"n1HU$M
时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。V
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我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。}C*Y3\u|UlyL)r
当然啦，这两款主机也是相当不错的。5H7Dpu7O)x
智强商务B型：Unix /Linux 操作系统+独立网页空间1000MB+送1000MB邮局空间+100MB MySQL数据库空间=1869元/年Cn
D,D NM:Vb!n[
标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年
u@,L}|cm#C 提供一下这个公司的联系方式：请见：[url=http://www.now.cn/vhost/]http://www.now.cn/vhost/[/url] 4l!S.c/Z4CfA
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'U~$Hg+l@ 自己加QQ去问吧。

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