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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！"r#T;nm)w6V
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。1H3c/E
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首先我创建MYSQL数据库表。;]Pk2Dg
q-\{
CREATE TABLE tablename (C%Vl1@%X|1i
field type(max_length) DEFAULT 'default_value' (NOT) NULL:K%u3swwZ:TA
}可以使用的SQL语句。
5oB&Fenx1^ `*u3P.s CREATE TABLE useronline (
*mmU$aA timestamp int(15) DEFAULT '0' NOT NULL,s9l1o9y8C-RF
ip varchar(40) NOT NULL,'y"Z^B!S-b/GJX
file varchar(100) NOT NULL,
4UX#c-o7U$x{$_J PRIMARY KEY (timestamp),

W1Xpj'C| R KEY ip (ip),
^.sQ)N)UZNx5@I KEY file (file)s?[d?d0XP H/W{
);下面我们是PHP脚本，首先我定义MYSQL的信息。*n&w(Q/a?0D%d
$server = "localhost"; //你的服务器
[g\5yx'A $db_user = "root"; //你的mysql的用户名
B SK
|V1jH $db_pass = "password"; //你的mysql的密码
^2[M.q,k,R $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)QOn;\&Y&BR
$timeoutseconds = 300;取当前时间。
)e7[/q \m$[_!JYE"b $timestamp = time();上面的完整代码：)]5M ? SC mu,J](n
<?php
cH*[]+v8Z nZ $server = "localhost"; //your serverLt6M9[y`
$db_user = "root"; //your mysql database usernamef7sF9Y.e;G
$db_pass = "password"; //your mysql database password if any
m#v)a `4I"{ $database = "users"; //the db names+C
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$timeoutseconds = 300;//timeoutseconds limit
f,p&nh;P5dh;u //get the current time
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\w#B+U $timestamp = time();
%{
}%b8x
c }m3[ //calculate the lowest timestamp allowed
C6{jwEX*\qJ $timeout = $timestamp-$timeoutseconds;!|z2BnQ
?>连接mysql
DT!{"_+C#g3G mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
V-bst&ov%K/G mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接SK#HND+]6u
mysql_connect($server, $db_user);查询数据库的代码：
G sOrG` mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。Q$]:h0sCh
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
&r(Y7};C_C^A$@ ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); {*} DFmR}#?$A#qWt
如果用户用错误信息的话，这样处理。)gw8X!\"L Z)s$~
if(!($insert)) {O_8{+UM7H e~
print "Useronline Insert Failed > ";
g'N)_/A%H b)q7n }然后实现当超过设置的时间就删除该用户记录。
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? $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。v5F)j*L9|W.O`.Q
if(!($delete)) {"OLr
PS
print "Useronline Delete Failed > ";,lcgo4`y
}下面我们解决数据库中不同IP的问题X9C6PSu&CVBBKt
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用r1Xd KJ,y
mysql_num_rows(query);来统计用户，代码如下。
c3zj ]zHs $user = mysql_num_rows($result);最后关闭数据库。
-j}6]ily pHQ mysql_close();显示在线的人数。 ZsPv},J
if($user == 1) {
.cJ"u:ec-@:J%x8E*?3S}!M%p print("1 user online\n");
A W f4I!g-o } else {;\,g|$fZ3f.n gM
print("$user users online\n");
0\_|#bcR }最终把上面代码写成一个PHP文件如下。
^1f-L}Hsv <?php
pZ%D
h-v!TO.oY //Put your basic server info here(F%wn-IbkVy [
$server = "localhost"; //normally localhost
z4i2Lwok5K,X $db_user = "root"; //your MySQL database username6{E }%`"p~ Z.Id;v
$db_pass = "password"; //your MySQL database password
,r%r|2J/Kbb$N[ $database = "users";xG!n!AGh
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$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably arev#GP,|RE e
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
2P ?:Aj wyI]} F // $timeoutseconds seconds)
9F]F ~L){`2w //this is where PHP gets the time
pp@lz0Pm#W"E $timestamp = time();
0Ta/W-BE`!NP //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed3mm1L/dX5_D3O
$timeout = $timestamp-$timeoutseconds;/yJ^%uE|EI
//connect to database.W#o OBtNa
mysql_connect($server, $db_user);%W4JN+`?9hp6O&~r8V
//add the timestamp from the user to the online list `?/aR(?'L#A6|I
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
j)]T:F.E1F,B ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");*t|bo2`g5Dpx#{
if(!($insert)) {
lA^xt9MK k!ZB6x print "Useronline Insert Failed > ";
i)D_1P,Kx$w }
#Av a9wh
e5M //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.&z,g1N[@/^
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
4q|6C3Sr.`,a6M if(!($delete)) {
\7jtH3r print "Useronline Delete Failed > ";?5a]W4gsNs `
}
%}JN.sZ z8J //select the amount of people online, all uniques, which are online on THIS page,T`4R#n.l&P3c7qZ
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");]5Ax+^(k
if(!($result)) {.M"hx3Alc;Vb0q
print "Useronline Select Error > ";:p,FR{_ PrM
}
ux!d(Ou //Count the number of rows = the number of people online
%CJ%|.IVDr $user = mysql_num_rows($result);
`9zE
kEvM$}?
//spit out the results
h([;e3R$t q*x:t n mysql_close();
fMp#_1JNkq7Ps if($user == 1) {F"V ye'h
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print("1 user online\n");}wY:S*V2_^
} else {
_rQ7wUC
[:k'I*A print("$user users online\n");

m0m)yCb(J#l }jS(]@rm G w
?>
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j1{B_"xM [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]R Hm(nMg
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。
"[4mp'F%[5` 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。tJ7U)Q2ygN|8J
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。
R
e@R8eD9A:u 当然啦，这两款主机也是相当不错的。/P*y}%@R
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!{L'v.\.T7Q{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HoMn
o-t)?5B8E'g
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]
\x.| Op6D9ms&j 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]3w1\:Q#AP O-A'W
自己加QQ去问吧。

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