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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！%bB+K8F[8{_
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。*n[qFfrFxy,~
首先我创建MYSQL数据库表。pZPo!xr
CREATE TABLE tablename (
"v)i#n_
N field type(max_length) DEFAULT 'default_value' (NOT) NULL
%u1i|6}Ma8o;?9H%G }可以使用的SQL语句。
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j-}3_fP CREATE TABLE useronline (oi| J7c o4@8i
timestamp int(15) DEFAULT '0' NOT NULL,WLoru!qA
ip varchar(40) NOT NULL,
dfx o]m file varchar(100) NOT NULL,aG}o4w+@
PRIMARY KEY (timestamp),b7a9B6f(pH"~#Gnwa
KEY ip (ip),,S6o{*u$\"IA^
KEY file (file)
to bQ2o );下面我们是PHP脚本，首先我定义MYSQL的信息。
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I $server = "localhost"; //你的服务器T'C
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$db_user = "root"; //你的mysql的用户名;D+~1IW{!QXb'i
$db_pass = "password"; //你的mysql的密码
5aF'jdl8|
fv4}0B+K $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
!cV:z
KE%t\-Mo $timeoutseconds = 300;取当前时间。&Y
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$timestamp = time();上面的完整代码：
&F8z7n q1zdtN <?php
"_y oM"GA+zdMQ $server = "localhost"; //your server
)lm;RrL)X $db_user = "root"; //your mysql database usernameTC:H'P3k"_t[p
$db_pass = "password"; //your mysql database password if anyV#A!p3qc0E(?,?
$database = "users"; //the db name
/U*et;Gix
gk $timeoutseconds = 300;//timeoutseconds limit
[ ?7jyR6P9Hi7HA3E //get the current time?$PMj[?7c
$timestamp = time();3K/c[+e
[[A*f
//calculate the lowest timestamp allowed
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m1N7f}+_ q-d $timeout = $timestamp-$timeoutseconds;
*WOktvv#M ?>连接mysqlotM;F JK u
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。&W}"^l$K-aj;t7U2P
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
1?1~Q [Kbe!J mysql_connect($server, $db_user);查询数据库的代码：0W,VG;E+q~5\ys
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。U_2B(uz
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES Em`/ZM7St@
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");:f*V%Gr+j
如果用户用错误信息的话，这样处理。
)R2Q%Hn3P\b:J if(!($insert)) {
5Or`2E:O$_+D)| print "Useronline Insert Failed > ";
*naG ?0npW.W&c }然后实现当超过设置的时间就删除该用户记录。
Ak4r"|4nh mg $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。]N.UD6FF
if(!($delete)) {~P$l}/O
^
print "Useronline Delete Failed > ";
Tx"ZW`+R4F }下面我们解决数据库中不同IP的问题
rJj!u Eq $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用.ZPe&bv8m&OwN
mysql_num_rows(query);来统计用户，代码如下。
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uJ8gzZ $user = mysql_num_rows($result);最后关闭数据库。5x0Aj{h!r.k
mysql_close();显示在线的人数。]H ? SQTv~E
if($user == 1) {
'od8t9OYT!a print("1 user online\n");Z)z"jj/X,P|/p c
} else {#J7`Li^e!n
print("$user users online\n");
j}.t!AHV0H }最终把上面代码写成一个PHP文件如下。
*m_ w-Jq I x <?php f:mIB,?8c {
//Put your basic server info here
ub2a%K`7Y $server = "localhost"; //normally localhost
/s6| v;y
D4^G $db_user = "root"; //your MySQL database username*Ri\ Z r4Q4G6MP
$db_pass = "password"; //your MySQL database password rlKC&C,f~a
$database = "users"; j @r*Ua/L
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
(c%m,Wb+k&DT d^ // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
?Q_/lI2\ // $timeoutseconds seconds)
u3UWkeB"C-}Re //this is where PHP gets the time
&n7`C)}:}ND $timestamp = time();
bh7q%V5R&n //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
6o9]%pPLl&a5f $timeout = $timestamp-$timeoutseconds;E3d}p4{
//connect to database v,E sI"Q U.?:Qv
mysql_connect($server, $db_user);fm,Ni%O+n0o
//add the timestamp from the user to the online listYRh$A6b
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES

q4S4BK Vm.O8E3f ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");,T]3h5X['qt5e)L a
if(!($insert)) {.`:w m0C0L/B3y5TF
print "Useronline Insert Failed > ";
;Uig H v%u} lE\;O }
8U8Xq2@oxcr //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.5Sd2r9ne9U%T
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
k*Tz3n]+Y if(!($delete)) { og0YtO+o
r
print "Useronline Delete Failed > ";*c`$pdU&y.h
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}
X'va-Y(c'ujl7|#U //select the amount of people online, all uniques, which are online on THIS page,h?M;T1at\ NJ
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");m c0I&bMUAJohvb
if(!($result)) {4b-U:D/V7r9Ux
print "Useronline Select Error > ";7KZg(G*`P@x
}q,d$T;p%C(R,x
//Count the number of rows = the number of people online.t WuU:{
$user = mysql_num_rows($result);"iK7z7z+}+e
//spit out the results^hQ2N?*H{"]
mysql_close();
;y8RMR"L:E,yVC/u;I if($user == 1) {hMHGC~w
print("1 user online\n");Ms+?tZ3iP
} else { N XL\z*P
print("$user users online\n");^.^
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[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]di)Wu \"r?
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。
Yt4bvD,m!r8J"^V| 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。6ZGRDKF;q|/o
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。
F6u!a3V}{miX 当然啦，这两款主机也是相当不错的。F e8nfC[];u
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
1qE!oQ.`K
M-jg 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
0rB;U+n]0e2w v 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]
` ~`;B/i*F 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]$f$PImK@
自己加QQ去问吧。

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