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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！
u4n2R"hZs1W?`!P 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。2~y!r T/H };t
首先我创建MYSQL数据库表。
%U(hl~.I ~ P+B%v R CREATE TABLE tablename (5~:M(b*m,{%{1Ff
field type(max_length) DEFAULT 'default_value' (NOT) NULL zS:@EG-nv'h
}可以使用的SQL语句。
-^S:Z+z$k4V)Pw CREATE TABLE useronline (
&M:ioo|+eV timestamp int(15) DEFAULT '0' NOT NULL,v
gYO5Bmt2i|b
ip varchar(40) NOT NULL,
o!^X$R;Gcyd/W file varchar(100) NOT NULL,
x's D&C6q,Z PRIMARY KEY (timestamp),,{7|,N(^/n3d.l]
KEY ip (ip),
s%I4\i3N-D KEY file (file)
O U Vv5v4jR
wv );下面我们是PHP脚本，首先我定义MYSQL的信息。p:Vros
$server = "localhost"; //你的服务器;?+A
px#|Y;u4`
$db_user = "root"; //你的mysql的用户名-]3n K8TwZ3`
$db_pass = "password"; //你的mysql的密码
:?;[yh]&[^$za $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)&^8l3S#Wm+t-uY\*PM"LW
$timeoutseconds = 300;取当前时间。4dHdO+h
$timestamp = time();上面的完整代码：
K(Vvx-|t2V_9ej9C/G <?php
Y#P2GJCG)\ri
$server = "localhost"; //your server
zK{*_:^3S6\ $db_user = "root"; //your mysql database usernamep6u@N+a%b,I } p
$db_pass = "password"; //your mysql database password if any
*cxJn } $database = "users"; //the db name
@ckO5c}F3O!Atn $timeoutseconds = 300;//timeoutseconds limit(SviK d H,^
R
//get the current timen g |o})k9\:|
$timestamp = time();
%x2i(b%Q*Tyx4El //calculate the lowest timestamp allowed"F Ld W@
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$timeout = $timestamp-$timeoutseconds;i$TI B[
?>连接mysql
-X:j.bh1U mysql_connect('localhost', 'username', 'password');也允许使用变量形式。j3i8u oa-tii@k
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
qN?}e5O'G$Sn mysql_connect($server, $db_user);查询数据库的代码：
2?nFc
c mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
0Q.A$Khy9_6u $insert = mysql_db_query($database, "INSERT INTO useronline VALUESkp)N+[3i-D)`0C
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
_+e1F*k"e 如果用户用错误信息的话，这样处理。;Z$Xg.@j s pQy:_
if(!($insert)) {Dz@$v*Y"w)l
print "Useronline Insert Failed > ";+^2b
H#~7C__JS |"?jg
}然后实现当超过设置的时间就删除该用户记录。;L
hv*U p3\+J
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。0s"O Fm*bG%n
if(!($delete)) {;{6u;O1Sf6Ca
print "Useronline Delete Failed > ";
De|Es(Y }下面我们解决数据库中不同IP的问题 P'W\!\6fq
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
9S(g~.g8s;w7f z] mysql_num_rows(query);来统计用户，代码如下。
6`!S2B*xsNV:j $user = mysql_num_rows($result);最后关闭数据库。5r&_9x1i6t
mysql_close();显示在线的人数。'I_!J!]K7I*O%y
if($user == 1) {.U#OPv3G,F4L
print("1 user online\n");
,UjE6m$_;~O ^I,]P } else {
Y;H&zj/Vu print("$user users online\n");W0u8g|h@)a1o2|
}最终把上面代码写成一个PHP文件如下。
R7iGXw/r+a{} <?phps;~ u&NC,Xt4i&P
//Put your basic server info here
R:bEUi@ vr'P $server = "localhost"; //normally localhost&sV`v2ig\#o D+`
$db_user = "root"; //your MySQL database usernameo#d3D b%~ y
$db_pass = "password"; //your MySQL database password
c,K?;[UF?U $database = "users";C B/FUT4|
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are?#Wn0[7p0N
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
(I0~ mce // $timeoutseconds seconds)9^A`0p!?_T4R
//this is where PHP gets the time
1X-w{;caw |V $timestamp = time();7mtA;Nh
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
jTy[t9|thr+e $timeout = $timestamp-$timeoutseconds;3e{6LjTp \
//connect to databaser#IWU+Rt|v@0D
mysql_connect($server, $db_user);
v C|@0[S //add the timestamp from the user to the online list
QO/^5fQ#|W5X $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
AdI6Cd6\
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
OOA
x\g if(!($insert)) {
6[%BAo j1KP print "Useronline Insert Failed > ";
%O!bJ S%Yj9{-]_2`"B"U }[%q%Xf hm!s
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds..B0Dc&eh q"r
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");O`BEbny+s*f
if(!($delete)) {
A{s o-Dx print "Useronline Delete Failed > ";
)o*SC1\EMb }
j |Y/cYK"^ mR/H //select the amount of people online, all uniques, which are online on THIS pageTDU,S-q
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");IROb:s4Yh
if(!($result)) {
L Bj,pu1s"GW.u2c$|r print "Useronline Select Error > ";~s{$u Iyt3i~q
},v2h+Z Q|K.x W%yx
//Count the number of rows = the number of people online
q7|} VuWPf;[$O $user = mysql_num_rows($result);
(L~"H#ZC{Oh Ym0p //spit out the resultsi"y'R'W&N@:L
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mysql_close();4he'q$M)Zx.L
if($user == 1) {A1h#O r2h$rp
print("1 user online\n");mY/i[@"Swh
} else {
PU T!Ob1nD5B0U print("$user users online\n");
nDAd6w
A_6?#E` }*z3y_#o8Hv
U
?>
eE k5Y0{F1l]Z-Kn [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]H%I I0w"]:j
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。]9y%N8k;H
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。
/Cx+\-PrZCn 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。

k8xq"xP1B 当然啦，这两款主机也是相当不错的。2H8g1Yp6M
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
1Z7V3KzbN 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f*BA'i3OO
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] y P,yvur
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]
+C6o ],zX8kY
y7f.h 自己加QQ去问吧。

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