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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！
n"]3a,m,T 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。
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u;h 首先我创建MYSQL数据库表。Welk~It
CREATE TABLE tablename (#u'Mdw)vG&kZ
field type(max_length) DEFAULT 'default_value' (NOT) NULL
g OLR-a ^9L7B }可以使用的SQL语句。D*pJH ZA`(mU e
CREATE TABLE useronline (

E6S'_*S{(e7xP timestamp int(15) DEFAULT '0' NOT NULL,
h+~SQ&Pm3a ip varchar(40) NOT NULL,4z
O#F-_:qf#K|
file varchar(100) NOT NULL,
g*s9Y~ o] d;li3K PRIMARY KEY (timestamp), U5M2Aw#l!N'p:Hhz,i0I
KEY ip (ip),
f5g0nY:N$GU KEY file (file)qv}
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);下面我们是PHP脚本，首先我定义MYSQL的信息。h:Jk?2fV
$server = "localhost"; //你的服务器 uu5F s;f
$db_user = "root"; //你的mysql的用户名FT0~%{P%@ rI~
$db_pass = "password"; //你的mysql的密码
(|U%Ecu5A7C?1E] $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
Y4l LEq/`7? $timeoutseconds = 300;取当前时间。OR*Q5pF2S#h
$timestamp = time();上面的完整代码：
H1]~&~2D <?php~rk}/OW Mf
$server = "localhost"; //your serverZ1Oo,d7A T
$db_user = "root"; //your mysql database username
'MK
iu9|9B-N ji] $db_pass = "password"; //your mysql database password if any$K
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$database = "users"; //the db nameH~TQm
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$timeoutseconds = 300;//timeoutseconds limit
\w?B@ @)g#kbE //get the current time I}N ]:l.d?LgZ*_
$timestamp = time();
\t0s~L //calculate the lowest timestamp allowedT P-|J!V3Z2]&`!P
$timeout = $timestamp-$timeoutseconds;
G[rnn7~0q&YZ6}'g ?>连接mysqlS)Z
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mysql_connect('localhost', 'username', 'password');也允许使用变量形式。{S7[s#Co6l'[
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接 o)X\5|)O;u^
mysql_connect($server, $db_user);查询数据库的代码：}:p,YSS@/U?!{
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
fHfy0FL8qA $insert = mysql_db_query($database, "INSERT INTO useronline VALUESZbA+K7sK L-LF
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");D;o/_#A'B&JS
如果用户用错误信息的话，这样处理。NeyW0[h.v4z%q4v
if(!($insert)) {
\;L aMO],h9j print "Useronline Insert Failed > ";
+Ii D1KR^MJ`jx }然后实现当超过设置的时间就删除该用户记录。
8F*DN\0eT $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
L*OR#OJX%i'~ if(!($delete)) {r)Jfd ["na)~&jQX
print "Useronline Delete Failed > ";
#R`gsL4h0tQ~ }下面我们解决数据库中不同IP的问题
;Q1|)e#ca6X1@/M $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用:tCv8AC|Ry Y
mysql_num_rows(query);来统计用户，代码如下。
_9uRL|&S|l:p $user = mysql_num_rows($result);最后关闭数据库。
L#}L[mLD4U mysql_close();显示在线的人数。
"I+A RH+G.M} if($user == 1) {$eO)J/w|`n+Lj8~:t
print("1 user online\n");-zk;QiN O9|
} else {!g _ x~jH4C2Nh
print("$user users online\n");
eeu_ D9e }最终把上面代码写成一个PHP文件如下。bpLbk(G*e$tPG
<?phpd["LxU$r
//Put your basic server info here
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$server = "localhost"; //normally localhost
q Z,d O#}S G $db_user = "root"; //your MySQL database username`0gM3Hny
$db_pass = "password"; //your MySQL database passwordO2o-yP-W&w w+F
$database = "users";yL`,Fv
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
4d-f/o*^f`-i L // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last\2^oV-q!K
// $timeoutseconds seconds)bYT0~S'~-G
//this is where PHP gets the time
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$timestamp = time();)O?;kHnf$\
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
R.A0uh(U%@dR $timeout = $timestamp-$timeoutseconds;5s0Fn^3OMuQ
//connect to database
%U2{*]2sj_ y%ZM2HZe2N mysql_connect($server, $db_user);l:S8f&rAgW&U"n0Xl
//add the timestamp from the user to the online listwa$K(v^B0FI:_
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
I+dDL&G;O+k| ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); _9_)ohuS3D
if(!($insert)) {
Dv/S2p,nA,] x print "Useronline Insert Failed > ";
A,oL9~ehQ }3b5i5@ kTg
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
ah'[a
~9eNMr $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
wC-p"Z"Cqc_ if(!($delete)) {#Ejsb4za _d!^%K
print "Useronline Delete Failed > ";
x(iv Wq \m%t:A }
3y:@#s!|1_'d1[(m f-RH //select the amount of people online, all uniques, which are online on THIS page
5?c9^1L4{2o $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");!N"D9w7H T
if(!($result)) {8YQ&Vgh}8x8NI
print "Useronline Select Error > ";
J*A~X4iC}e }9wF(x VB+M8Q
//Count the number of rows = the number of people online
}%U}3DR_ $user = mysql_num_rows($result);
!oC;qCt'S~ //spit out the results
s*UzaI |!Q5d] mysql_close();
2Y5I;PZKt(D if($user == 1) {
y7]W~p print("1 user online\n");
^;y(hW3xdoI } else {CUw\+[m/tU&Q5g
print("$user users online\n");
g"MOrcj }
#N"bK$l"X7v2y d.X ?>
pJ}#y:Vd [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
7e0]YwF*BJB 以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
tO1y
j"G2u 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。
?HWS$VsN1^ 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。
3sB K(q.p?XU+j 当然啦，这两款主机也是相当不错的。

\%O:?6|XZ ?.w 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joD:e,U/\|,?
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
*UZH Ls 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] U(m!BW W{
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],@'Wk4t [{
自己加QQ去问吧。

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