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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！_]xg8S%b
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。cw/p7nPD\YtL
首先我创建MYSQL数据库表。t8y1| ~b8}s3L
CREATE TABLE tablename (@
~?SU ~1f
field type(max_length) DEFAULT 'default_value' (NOT) NULL
%|M;[O6{^%p.J!N-G[ }可以使用的SQL语句。WKyj2qv
CREATE TABLE useronline ( T8Ss} x"Y}9Y0f4n5H
timestamp int(15) DEFAULT '0' NOT NULL,$kQr${ y:w)`o mO
ip varchar(40) NOT NULL,
R$m co].|/{ file varchar(100) NOT NULL,
p'U&Q,~-M/cH PRIMARY KEY (timestamp),
2d+M(Y!R+M1IA\$I KEY ip (ip),^C-x'ITv
KEY file (file):J4gc{t4LY2|
);下面我们是PHP脚本，首先我定义MYSQL的信息。r&_V5o"bKAc1v&?
$server = "localhost"; //你的服务器+p:o/B&d9[&_gri5Dn3{
$db_user = "root"; //你的mysql的用户名]N ?vaO`V
$db_pass = "password"; //你的mysql的密码
WJ%@Jk-K)ar[ $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)!r IB)P,J*W/l;_([k
$timeoutseconds = 300;取当前时间。
7SO8F'k,p $timestamp = time();上面的完整代码：
M3fsB*Qt;v2SV <?php
&r I,Z3sj2S/} $server = "localhost"; //your server j7R {W aG$}K
$db_user = "root"; //your mysql database username
/tUN;qm)gy[ $db_pass = "password"; //your mysql database password if any8O1Y Ghh.Sv
$database = "users"; //the db name
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jj-WSQF%F} $timeoutseconds = 300;//timeoutseconds limitS7x/f:R&V&j
//get the current time*Q'a%{1^-}Z'D1t
$timestamp = time();
U o)}2Q5?DE$kh^{ P //calculate the lowest timestamp allowed;zug#@$d
$timeout = $timestamp-$timeoutseconds;
;XP/sC(Sk ?>连接mysql
r:ea)F'\x mysql_connect('localhost', 'username', 'password');也允许使用变量形式。8F{,K@5R5^
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
'f"^:r
p:[-ZP mysql_connect($server, $db_user);查询数据库的代码：
F];MzQ1C G+Vi mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
,z2Y&q8O3Q $insert = mysql_db_query($database, "INSERT INTO useronline VALUES*yMV%RN+i1R iF
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
#G#zWm7\g 如果用户用错误信息的话，这样处理。
'S(S;x9^~'FgOc if(!($insert)) {
w)ifKDON } print "Useronline Insert Failed > ";
Vp4t}R7JA`M }然后实现当超过设置的时间就删除该用户记录。
9l$Y7} qmb?l7iI%E $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。y?'v0cA)O%Th
if(!($delete)) {
heL:h1L8^MX_ print "Useronline Delete Failed > ";.RhY~GSM
}下面我们解决数据库中不同IP的问题RX-u8_*u6R~z
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$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
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qT7V/\j$g!N mysql_num_rows(query);来统计用户，代码如下。7D!Fo#QB'rg1mG!G
$user = mysql_num_rows($result);最后关闭数据库。 G'U%Y;eVO5n8nb
mysql_close();显示在线的人数。lQn4C1e*^2V
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if($user == 1) {
-m8?I"h^K-A,Qs!~#W J#^8k print("1 user online\n");pba&ck!w,ex Uu
} else {
9^AIHte%G:v ZP print("$user users online\n");
Wg d&nu(QH-{ }最终把上面代码写成一个PHP文件如下。'u}.L+Q K*q$j
<?php
't)Q `0BF"u?M)S*P //Put your basic server info here JFq%q4|K%@
$server = "localhost"; //normally localhost)l Od-bFv5Yj `x
$db_user = "root"; //your MySQL database username
d5o ]5g\Sd4G'\ $db_pass = "password"; //your MySQL database password
xG;W;aYxw $database = "users";5`+X2E
Zc%b.K }#A,p~
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
(y,@9P'FUX(` // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the lasttT]hxk
// $timeoutseconds seconds)6]J-k5IIS!MfCl2Xc
//this is where PHP gets the timeUm{|s)DGs O
$timestamp = time();
ZK:tB
Q._ //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
b%G(ej
E $timeout = $timestamp-$timeoutseconds;
6Cg/s}'s&h_w2hW //connect to database+}[2o,t\`]
mysql_connect($server, $db_user);D.`IrRS{"e9q5Fq
//add the timestamp from the user to the online list"tJ(Ch q:Q
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
l|?*Yr ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");s[#pl{_[
if(!($insert)) {)is6y&Y1Y}I Pr({
print "Useronline Insert Failed > ";k.f'pzuRKA;f`
}
yu@;sh)s //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
nMuIrKkE3O $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");[ _-?Y(BboeE
if(!($delete)) {
#Xx
zu0g print "Useronline Delete Failed > ";
&|lC
e
IZ4R,y#l }
!y#s%_pk w@#?0S //select the amount of people online, all uniques, which are online on THIS page.~+MVc4_.}#M
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
_*? SVO#y c S if(!($result)) {$s!rE;|G|x
print "Useronline Select Error > ";G7vV&Ey!E@!R
}
o&Ba5A Rt3z //Count the number of rows = the number of people online
w9T*HPyP $user = mysql_num_rows($result);
x^x9F,v //spit out the results
Rc"Kut&O(? mysql_close();6\OW0_ I2i8{2y
if($user == 1) {
:\P-w/s
X;l print("1 user online\n");
^ Z:op&tku
a#OOz } else { }H7s y*LN-X!C
print("$user users online\n");o-U'RN.V+^hz
}E
u
ZJ*~5_
?>
5a3_ Wwg,hs? [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
:XF
B|2eZS y K 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。+a L5rmE-sV8u4E
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
Z7V!Ca 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。
vMDe4y'y 当然啦，这两款主机也是相当不错的。
l!Ea,fO5tA:xU 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
T^1]4km2H9@ 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
Sh+|1b#KK0`P+_ 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] ZBe*a;nxtY
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] i_Rl#B!bB
自己加QQ去问吧。

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