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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！*O J5v]!wr!a4t
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。

a6m7z*Ulg 首先我创建MYSQL数据库表。D)F$CfS#c,d@%\
CREATE TABLE tablename (7_hI7g:b9y
field type(max_length) DEFAULT 'default_value' (NOT) NULL
wlx aTCb%a }可以使用的SQL语句。ZqQe4`tZ:[o
CREATE TABLE useronline (
/?{gLvx timestamp int(15) DEFAULT '0' NOT NULL,
bI*F
a`V*v ip varchar(40) NOT NULL,
&h-wP8VT file varchar(100) NOT NULL,
U{5o"yR N PRIMARY KEY (timestamp),5u.eLG6n Z%{
KEY ip (ip),4\
cK!y IA4m
KEY file (file)*@LlQr;cF|
);下面我们是PHP脚本，首先我定义MYSQL的信息。|v'mv%V)OG h [C
$server = "localhost"; //你的服务器iCAw+tV@
$db_user = "root"; //你的mysql的用户名
+tF K'F/IUf$pj8n $db_pass = "password"; //你的mysql的密码
%Y;c.J
x[;i-fx,L)? $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
(I*E6eL+SnO"bm $timeoutseconds = 300;取当前时间。Kj`3t[|(t
$timestamp = time();上面的完整代码：
|${!m0jvb5_,E <?php
@ P1^a,x:Z:h P $server = "localhost"; //your server-O)aY7}I'Ypv ]l
$db_user = "root"; //your mysql database usernameF kY&jE$vC
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$db_pass = "password"; //your mysql database password if anyUN,q/s {_Cf
$database = "users"; //the db name'S*g WA \ O'~
$timeoutseconds = 300;//timeoutseconds limit*J
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//get the current timeoc4wL1{{9@a
$timestamp = time();3Ka[q_ k&o&Q
//calculate the lowest timestamp allowed
4^D Y)~z,v$F_ h2lP_w $timeout = $timestamp-$timeoutseconds;
LoF$y7l.n
C*h!ew;z ?>连接mysql@|j6Ut#a^+n
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。 };M-` h4G[
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接#hq!e8}"wh&Z9R
mysql_connect($server, $db_user);查询数据库的代码：
)lT1uys#d}5S} j mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
Z,Xq$hs$E9H7k+^ $insert = mysql_db_query($database, "INSERT INTO useronline VALUESX ByIR$|
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('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
FVPqZ5C 如果用户用错误信息的话，这样处理。
Ye9V6o5Oz if(!($insert)) {5H,G'KdaM&iK
print "Useronline Insert Failed > ";y%Rmf6m'E
}然后实现当超过设置的时间就删除该用户记录。
P4ujs:Qs"Gd $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
UZ0m [7d.I5i(A if(!($delete)) {
$v| n3v/F4I"L print "Useronline Delete Failed > ";*P#Ga n/b"z0sx'H g
}下面我们解决数据库中不同IP的问题
G3UKzr{H%t $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
!p V-[1\0V mysql_num_rows(query);来统计用户，代码如下。b-\
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$user = mysql_num_rows($result);最后关闭数据库。
4lcPF7`*`JhY2B mysql_close();显示在线的人数。
(x,gj#|At if($user == 1) {
9?f8i\l"V7`-P4}9R)ug print("1 user online\n");
Zh;ci6}UV'@brr } else {(P sX_6\;Z6x(T_5g/S
print("$user users online\n");
2TRu,}3[/O&e}O!l:B }最终把上面代码写成一个PHP文件如下。
DNA.D T7b <?php
Em WT:_%t //Put your basic server info here
&{_9A7@ o $server = "localhost"; //normally localhost-fTdY~dB J
$db_user = "root"; //your MySQL database usernamed@`xE
$db_pass = "password"; //your MySQL database passwordo'Z s4Z+o
$database = "users";~ Ila0?
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
Q4lb?_P6[4r.j // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
0q _(a"{ m$^ vzM6a2g // $timeoutseconds seconds)EK1IK [f&b0xJ(eM
//this is where PHP gets the time
/zZ/}:I8I $timestamp = time();
s2yqWY R9w~ //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
H]&k.Tif $timeout = $timestamp-$timeoutseconds;Sv9x{9~2jP
//connect to databaseE3Q
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mysql_connect($server, $db_user);
e xH2vY0~P //add the timestamp from the user to the online list
t{Z|'BzM8b
Q $insert = mysql_db_query($database, "INSERT INTO useronline VALUES`0p
p3eaAlW
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
&tAg6F$rs*B if(!($insert)) {
&s.w q!_6h+Y i(B print "Useronline Insert Failed > ";
P.O B7}3`q0WO\5T }:gh }@Z{'j%g
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
n-N!{dIj | $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");f$E.eLn,Wd!P!U
if(!($delete)) {5f!\Zm"PA.U
print "Useronline Delete Failed > ";@
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i9e)_x
}
\_z9Q,CDt p
y0? //select the amount of people online, all uniques, which are online on THIS page
$V$G6V@(U1l $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");2J-rA.e?7AhRG)s
if(!($result)) {
N3Mx]jQ2y print "Useronline Select Error > ";
"S S
f&vX|J%\3ad }
MG:Ddsu0O //Count the number of rows = the number of people online
jp3xHKJ $user = mysql_num_rows($result);
X
\`0WnK;IT_0KS~ //spit out the resultsDbk7Y0R
mysql_close();
x"@W:n$FNx"`"W9{ if($user == 1) {
K,]l-{:TUo print("1 user online\n");
L"OWhqS } else {
9D-On*k's8V print("$user users online\n");
5U
o,mg)V\ }c/dAWr#e V3Sw)S:op
?>
] @d$NRB [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
5GqE8G;p 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。
)yb |2Y$|}} 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。{$O$`,d+o{EC
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#f] elp S(gU;T 当然啦，这两款主机也是相当不错的。
+h5R6mfYx 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HS#~#w8JS*r0D"a
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\BNqp'P/Y
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] \\a'AR,{
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]
'nH&i)D gY[[7a@1x,t-iX 自己加QQ去问吧。

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