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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！
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d[H.\ 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。'fgjPR#Wwd
首先我创建MYSQL数据库表。
P+T2qy eul |N:K CREATE TABLE tablename (k8^&|\fI
field type(max_length) DEFAULT 'default_value' (NOT) NULL'pwg(fA.oC
}可以使用的SQL语句。
&Gp!d'ugf CREATE TABLE useronline (;Q8_qtu@8S
timestamp int(15) DEFAULT '0' NOT NULL,l7B:sUV2n ~
ip varchar(40) NOT NULL,
vm}b*Qld file varchar(100) NOT NULL,
'S,^3I_PX+M PRIMARY KEY (timestamp),
0u9K'^}$r KEY ip (ip),
2^U1sjCw*x9xm8vJ KEY file (file)
#t"{rZV:s );下面我们是PHP脚本，首先我定义MYSQL的信息。e'j%aR+h
$server = "localhost"; //你的服务器
sDJ;Co_5p)} $db_user = "root"; //你的mysql的用户名
iSjF.`l$QK/b*y $db_pass = "password"; //你的mysql的密码 P6mOgE(yB
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)6ZH/L2`)F|
$timeoutseconds = 300;取当前时间。(xCW0yD*S!C~-[!P
$timestamp = time();上面的完整代码：
(b!\?q.@[z <?php
3x:nEd-Gn P $server = "localhost"; //your server
g0O*TM8`D $db_user = "root"; //your mysql database usernameak]oY;He1bAjx
$db_pass = "password"; //your mysql database password if anyF^^8Cr2\gf Y9e
$database = "users"; //the db name
2O_z {7t $timeoutseconds = 300;//timeoutseconds limitVt)KYWDOtu
//get the current time
!gc1@*D5Q+? O $timestamp = time();
Ibg^%V*Z5hU //calculate the lowest timestamp allowed,V%NpSA/\
$timeout = $timestamp-$timeoutseconds;6I$oQC_` U-]M2CM$y
?>连接mysql
:r7CY5[o6k mysql_connect('localhost', 'username', 'password');也允许使用变量形式。-nWx l t5{'\['r*m
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接h.P!am&k+q5v
mysql_connect($server, $db_user);查询数据库的代码：
-yW-[}Ei_;t} mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
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GF lM'[!A $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
UI{&~
}5x5{Zg ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
6kq&tdI/In 如果用户用错误信息的话，这样处理。
RqD$a"[FP:K if(!($insert)) {
z`W%o8Pr;Y` print "Useronline Insert Failed > ";
9s Yh,c9Z }然后实现当超过设置的时间就删除该用户记录。aq1aiJW]
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
C6R
C#sm(]M \1v if(!($delete)) {
k8p(PZ"R
FsVM
G6b;] print "Useronline Delete Failed > ";3?#N-G(jZZ6X,y3S
}下面我们解决数据库中不同IP的问题
4jF5l)`?Q+Z6r#` ?h $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
|a ^,KlU#G;f
Nv mysql_num_rows(query);来统计用户，代码如下。F1b t]*|U;xw
$user = mysql_num_rows($result);最后关闭数据库。
R4Xn:o#u mysql_close();显示在线的人数。
UQ9P*rh if($user == 1) {`jFH-@)e
print("1 user online\n");'["v:X
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} else {(eD;Xc:ZM8J|(T
print("$user users online\n");
2]{1l9~ NG%q }最终把上面代码写成一个PHP文件如下。
aBDQ:G)\9O!u <?phpT3v_ A0xo5O!{e
//Put your basic server info here
8O
["jk)KrO [%_J $server = "localhost"; //normally localhost WrMW*g,B
$db_user = "root"; //your MySQL database usernameR-gWf!_HP"|Mlw
$db_pass = "password"; //your MySQL database password
R3oU1E9A $database = "users";
?'|)w,C[$A'Q,S $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areZ]r HVx u(Y9s
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
m|c%tv8~(NAg // $timeoutseconds seconds)
/P&ci%U"E7Z&|J //this is where PHP gets the timeI6i~o V Z^9nEi
$timestamp = time();
iQ"|5io;|0Q |.V //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
E&A0zJ7w4DB6I $timeout = $timestamp-$timeoutseconds;
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//connect to database$aCm:|%m(U3],?0f#NGG
mysql_connect($server, $db_user);
"t I b7~:`7bpk //add the timestamp from the user to the online list
a,\8W!B2_9A C J $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
8U,f?7j4|*d!O#D3O)V ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");+gEHU Xu \"{
if(!($insert)) {
;q(V8U.TF4i print "Useronline Insert Failed > ";x(nF|MJ0H:y'|
}
,\%B.U!]6F:H4K //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.+iHW7vK2e
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
ZuL,OS^Mig if(!($delete)) {!L NsG1w*]
print "Useronline Delete Failed > ";;_3JD1}XS{:G.t7So
}aD&TP zBR*`
//select the amount of people online, all uniques, which are online on THIS page@[~1a5I!He9}T
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");+s`1\~ [dK'K?h?
if(!($result)) {
,Z/p&X3dQ(aV:R@+f)H] print "Useronline Select Error > ";
sANE7P
tbX)x#] }+?L4NjF+j7jQ
//Count the number of rows = the number of people online+? {L IFL b
$user = mysql_num_rows($result);9V/WrVv'RsOR
//spit out the results
%^i4^go#z|(n mysql_close();
8__)K`w if($user == 1) {3l&nA%O&qx#a]
print("1 user online\n");
7N;^`(]~3~N.K } else {B9x8h2aFt'|}
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print("$user users online\n");&H$i8G*V K V/l3h
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[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
+A}8@T+@d'u-` 以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
d!ZV T9b,EIK-b 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。
o7v#v;Vx2Mgs 我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。/L9A8dl.{7T3m/QU
当然啦，这两款主机也是相当不错的。
2Q&MP0evVL F 智强商务B型：Unix /Linux 操作系统+独立网页空间1000MB+送1000MB邮局空间+100MB MySQL数据库空间=1869元/年
E(eg `0DW;x 标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年
+J\oU/|^$H0X 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] :y5\ o's$StV
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]:hPWbc+^otD M
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