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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！
N6x%I9u|)g'M h*^Z 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。 C/`}2_D?9~*}
首先我创建MYSQL数据库表。
b!E3{ B/N'fy CREATE TABLE tablename (g(q1sR7Z
field type(max_length) DEFAULT 'default_value' (NOT) NULL
Jh8ABg6i }可以使用的SQL语句。[ k7\ EZ"Qb5F-RP+_D.v
CREATE TABLE useronline (Xif&rlH+c
timestamp int(15) DEFAULT '0' NOT NULL,
n*i:s-Ooio ip varchar(40) NOT NULL,
*{%y;ld~+Vm#mX file varchar(100) NOT NULL,"KVS!F(m r0f[ V
PRIMARY KEY (timestamp),
r [
lt"V([h KEY ip (ip),}6I)`/yQg,k1S
KEY file (file)
@c}G!cg );下面我们是PHP脚本，首先我定义MYSQL的信息。
u ^8M0r _ $server = "localhost"; //你的服务器"O$T)K"e'vx-g#v%?4v
$db_user = "root"; //你的mysql的用户名 _ E;P K+_(TU
$db_pass = "password"; //你的mysql的密码#DJ8t!N;x%x1R
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)*y~ U,tl
$timeoutseconds = 300;取当前时间。!^T}muE
$timestamp = time();上面的完整代码：$?+?0^B#EH,n
<?php
Eel?M"e.k9C B $server = "localhost"; //your server
\Re` z;^ $db_user = "root"; //your mysql database usernamed*zt`5H(yE_"d
$db_pass = "password"; //your mysql database password if any!^)Z!W+fN1O'O ~
$database = "users"; //the db name/h\&z5Y(Iric
$timeoutseconds = 300;//timeoutseconds limit S,y|l&k\
//get the current timef D$kN d9? Zw(i
$timestamp = time();
X-f?:N3~+o#My //calculate the lowest timestamp allowed
_j,|%VFz |2reo $timeout = $timestamp-$timeoutseconds;
J]o&Sx?'J&HnK;B ?>连接mysql
!Da(B0xb haTi mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
h5D?[x.lU9B mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
.G+e5K(a+r t mysql_connect($server, $db_user);查询数据库的代码：6d Lv)C7Ol
b
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
i3s)}t]L?Y $insert = mysql_db_query($database, "INSERT INTO useronline VALUES~@Y
`Uh5o
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
6kz'A;R)NTjjv!a 如果用户用错误信息的话，这样处理。C`+^(r9Rx(Cg4|
if(!($insert)) {8~w S&B&K6aLl
print "Useronline Insert Failed > ";
2W+eR1p
I/j-~d }然后实现当超过设置的时间就删除该用户记录。
:[S~:[*F $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。.o4kL.]~ T]Y [+Z9J
if(!($delete)) {,B3A J,q7TA%I n;Z
print "Useronline Delete Failed > ";
Xw+aCCg3^O }下面我们解决数据库中不同IP的问题
7Ld+s@c4u $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
\"z#p7gW)s8\8U mysql_num_rows(query);来统计用户，代码如下。
F4L.|?U2i(Y7k? $user = mysql_num_rows($result);最后关闭数据库。

`'@!j~ a mysql_close();显示在线的人数。
0\TF'S#T5}.t5G,I if($user == 1) {l2t"V\BNi-A
print("1 user online\n");
gIvJs_@ } else {
DjZ$b2V2V^k9kP print("$user users online\n");:xNnA`B
}最终把上面代码写成一个PHP文件如下。
{ t {4c:F/Y~ <?php
y[(s6|Z1r}0WU
//Put your basic server info hereo3B9} [S-N5re$v
$server = "localhost"; //normally localhost
.j.g {&vC $db_user = "root"; //your MySQL database username
}R/E[U7M};U $db_pass = "password"; //your MySQL database password
$d3OH@4? $database = "users";
y5~$U4t:T8r $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are%k#sTb$[
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
pue9Rsa // $timeoutseconds seconds)Oqz"?^%Q
//this is where PHP gets the time
Kq/z8~A d4C+P*c:` $timestamp = time();#S8lu.W-xI5z!N
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
-B3t8A!Z|8CC"q
T $timeout = $timestamp-$timeoutseconds;}C0cA:mp
//connect to database
(@3t?hHU mysql_connect($server, $db_user);"N%PT&V HDt3nQ
//add the timestamp from the user to the online list/K:M9O&Z2b+z | p&Q
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
,g"C^ {t d5?} ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");WIB'O%G*g S5lA
if(!($insert)) {s,mQ/CF X3U4w|!_
print "Useronline Insert Failed > ";
J1U8E-f0gM,] }3k'Rcy&L-P/M
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.:u7L#w)o|
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");*F1B$qF;qE0s
if(!($delete)) {N\&v4sb0En%lW"j3k
print "Useronline Delete Failed > ";z X1B ^;Q
}

M N6gO%V[sP //select the amount of people online, all uniques, which are online on THIS paget2sFv)x\
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");AQB(W C!B
if(!($result)) {
:Bp/kX#fkt@zd4If print "Useronline Select Error > ";
-YOO,b
XD@ }/D4g*dF%o(D0B xb_?C
//Count the number of rows = the number of people online
)}r!|f u2_W~/El $user = mysql_num_rows($result);
X\$`G&D}.{ //spit out the results
X@V/`c
mysql_close();hfu.{b-U/P
G'v!@
if($user == 1) {Ay {h,m{9b?4i
print("1 user online\n");
PHl8Xq4PN } else {
iN8W eBfI` print("$user users online\n");
y})\U}e ? }
;e"{uj9M ?>
:{0q"l$x ie
V;W [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
2T"O@:q#GO#}+~"J9y 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。
X-u]3c7oC*i 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。
9V7v'M Oh ` 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。
%E;JX Z"y c5B 当然啦，这两款主机也是相当不错的。Lh9a,Jn |+yB1[
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7G3tjQ Zd)w r
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Mo-{;t?/[:B
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6p W7p[8R*{ 自己加QQ去问吧。

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