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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！
o0DQ-u$}Hg 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。%S7G[b hD&u U
首先我创建MYSQL数据库表。
?
Z%iW(e&[bz CREATE TABLE tablename (

Tn$L:? ^.Ku `"x field type(max_length) DEFAULT 'default_value' (NOT) NULL
q }/DdN_ }可以使用的SQL语句。
9Uy2ZU%J\)Y CREATE TABLE useronline (
@mTuI;SMi timestamp int(15) DEFAULT '0' NOT NULL,
8eSa1?N*B ip varchar(40) NOT NULL,*Y4~ @[n+u
file varchar(100) NOT NULL,.}-bYEiT7G
PRIMARY KEY (timestamp),!IZm3e d}hC;[C
KEY ip (ip),a\&G.J*E5Uu:?Cqwe
KEY file (file)9FW$NaV
);下面我们是PHP脚本，首先我定义MYSQL的信息。
lhIDd3DEJy $server = "localhost"; //你的服务器'X8NNDF$},E
$db_user = "root"; //你的mysql的用户名x Ob.s*s|
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$db_pass = "password"; //你的mysql的密码
Y+]^.M3DL]q $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)S`7x:kM.]e:hs
$timeoutseconds = 300;取当前时间。7[&C:F W"W1?dxq3u
$timestamp = time();上面的完整代码：4^9Uo+`Fb
<?php,we'|{2|
$server = "localhost"; //your server
ySVt
k $db_user = "root"; //your mysql database username
\0ipUx+Rw $db_pass = "password"; //your mysql database password if any[~I[;]
$database = "users"; //the db name|3q$h6OJ ~j2eSx
Z
$timeoutseconds = 300;//timeoutseconds limit(G(u^9f[.g/D
//get the current timeB,s"p/H5YM[&|fI1?
$timestamp = time();"a`-M\(Zu
//calculate the lowest timestamp allowed%\0t4Xk L2o$T
$timeout = $timestamp-$timeoutseconds;? B@
vQ.a{
?>连接mysqlf*icy+`~@7`h8o
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。mteFD1t'E-sYQx
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
,E!V&n] EM mysql_connect($server, $db_user);查询数据库的代码：
1^,{%Ea$xEin mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
]'X Qo#z#[7v $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
"a~zk
h
Cw*a` ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");*P,R.Vm3~emb$MM
如果用户用错误信息的话，这样处理。
g!jkQ(P(\ if(!($insert)) {Y7t%f/p#Z
h
print "Useronline Insert Failed > ";8^QJ|g0f;i5D
}然后实现当超过设置的时间就删除该用户记录。
$[,s`5xe $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
4\'i+@0R'a;|:cf/| if(!($delete)) {
y:O e ?0]@U%bp:S2j print "Useronline Delete Failed > ";
,_xQ@R }下面我们解决数据库中不同IP的问题
3x$Z`Y/K&Jlh $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用n*h&e!M;{)Ck
mysql_num_rows(query);来统计用户，代码如下。
DU2h hoQ $user = mysql_num_rows($result);最后关闭数据库。
c5m cqDL$?7Q6Kyz mysql_close();显示在线的人数。:D%W h/? ~,sY6i
if($user == 1) {2HumF,X|L
print("1 user online\n");
RKd6d,~C } else {
[I!p8N9CP:L print("$user users online\n");
zy%F@V.VE\ }最终把上面代码写成一个PHP文件如下。a}? A6N
<?php,uL.C5~"f0gD5Y
//Put your basic server info here%l:q
lT}I:\3`
$server = "localhost"; //normally localhost
-qB'b[.C#BuS@ $db_user = "root"; //your MySQL database username
r3PJ@w-g#a $db_pass = "password"; //your MySQL database password
y9M:Q-R]{L $database = "users";OmD0}"XNVV8F,C.\L
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areGX2s%R"K#r8D
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the lastrE5lMG e_?1R8J]
// $timeoutseconds seconds)
,yF7iW5YMw$| //this is where PHP gets the time0_.L V,f~)i
$timestamp = time();
.X"S"hs|+dR'| ] //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed

`E7DG-p}J9n $timeout = $timestamp-$timeoutseconds;
~ s#e4}K"\.mv //connect to database
4~!T1d$B(b^%H0T mysql_connect($server, $db_user);
*w2o/JYt1S] //add the timestamp from the user to the online list
,s(pgFn+t $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
mc/f!G-H5bW ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");Nv8^#g_&LZ
if(!($insert)) {
$~)~Vz8Z+O print "Useronline Insert Failed > ";
%V*q;It&Y1qiq*q }
]
D+\9H j //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.+e-e6Hhueh%~ [
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");6Ny&ev(Y:u,tr
if(!($delete)) {
)Z'o*p[$X
h8C print "Useronline Delete Failed > ";.O7bZ bV1t
}x)w~*u?:@
//select the amount of people online, all uniques, which are online on THIS page-v2P[-Ss/o)xFmn
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' "); d.j*`4_6eg(Hk
if(!($result)) {
#F%tp{Q#~*{.h print "Useronline Select Error > ";a[Otb3eD
}
"h6k(A*I C5B@,i;?_:b,_ //Count the number of rows = the number of people onlinec6LW2M6e
$user = mysql_num_rows($result);T&n/k ]0g)w-n)tj
//spit out the results4Cd N"y:o6A
mysql_close();j(]V S C&[}.Dp+Nx
if($user == 1) {LS)OlI b2|
print("1 user online\n");
P\T:D Y@'t } else {
Nr`6L:WF8\pX:S&p:~ print("$user users online\n");
*o'XwJa }L$n*C#WWj'C'?
?>/Z@ x7SQN
[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
0B{ Q ybMefCC 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。
e8iipI j6q*At
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。
%R*p*s_-Bs{ 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。;_v+]
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当然啦，这两款主机也是相当不错的。L2e2_bU3kI
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
#O:n8p)j%H0K-_
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
O&M(NYQR6@6qo d7~5R 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]
] q/z-@OFn;T ? 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]
(H8V-yV0W 自己加QQ去问吧。

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